Unua Oficiala Aldono (1OA): the 805 official roots

• abism- abyss
• abort- miscarriage
• abstrakt- abstraction, something abstract
• absurd- absurdity
• aĉ- awful
• adept- follower
• adjutant- adjutant
• admiral- admiral
• adopt- adoption
• Advent- advent
• advokat- lawyer
• aerolit- aerolite
• afiks- affix
• afiŝ- poster
• aforism- aphorism
• afrank- postage
• afust- gun carriage
• agat- agate
• agent- agent
• agoni- agony
• agraf- fastener
• agronomi- agronomy
• akaci- acacia
• akademi- academy
• akci- share
• akciz- excise tax
• akord- chord
• aksiom- axiom
• akt- act
• aktor- actor
• akurat- punctual, on time
• akvarel- aquarelle
• akvari- aquarium
• alabastr- alabaster
• alarm- alarm
• album- album
• ale- alley
• alegori- allegory
• algebr- algebra
• aligator- alligator
• alkohol- alcohol
• alkov- alcove
• almanak- almanac
• ambasador- ambassador
• ambici- ambition
• ambr- amber
• ambrozi- ambrosia
• ambulanc- ambulance
• amfor- amphora
• amnesti- amnesty
• amput- amputation
• analiz- analysis
• analogi- analogy
• anatomi- anatomy
• anĉov- anchovy
• anekdot- anecdote
• angin- angina
• anonim- anonymous
• anten- antenna
• antilop- antelope
• antipati- antipathy
• antipod- antipode
• antropologi- anthropology
• aparat- apparatus
• apati- apathy
• apetit- appetite
• apoge- apogee
• apokrif- apocryphal
• apolog- apologue
• apopleksi- apoplexy
• apostol- apostle
• apotek- pharmacy
• areometr- aerometer
• ari- aria
• aristokrat- aristrocrat
• aritmetik- arithmetic
• arkad- arcade
• arme- military
• arom- aroma
• arpeĝ- arpeggio
• artileri- artillery
• asert- assertion
• asesor- assessor
• asfalt- asphalt
• asoci- association
• aspekt- appearance
• astm- asthma
• astr- celestial body
• astrolog- astrologist
• astrologi- astrology
• astronom- astronomer
• astronomi- astronomy
• atlet- athlete
• atmosfer- atmosphere
• atom- atom
• atribu- attribute
• aŭdienc- audience
• aŭkci- auction
• aŭtentik- authentic
• aŭtomat- automat
• aŭtomobil- car
• balast- ballast
• balkon- balcony
• banderol- paper band
• bank- bank
• bankrot- bankruptcy
• barbar- barbarian
• bard- bard
• bariton- baritone
• barometr- barometer
• baron- baron
• bas- bass
• bastard- bastard
• batalion- batallion
• bateri- battery
• baz- base
• bazilisk- basilisk
• beletristik- belletristic literature
• benzin- gasoline
• Bibli- Bible
• bibliotek- library
• bicikl- bicycle, bike
• bifstek- steak
• bigot- bigot
• bilanc- balance
• bild- picture, image
• biologi- biology
• bitum- bitumen
• bivak- bivouac
• blasfem- blasphemy
• blazon- coat of arms
• bluz- blouse
• boks- boxing
• bombard- bombard
• bordel- bordello
• botanik- botany
• broĉ- brooch
• brom- bromine
• broŝur- brochure
• buduar- boudoir
• buks- box
• bulvard- boulevard
• bust- torso
• car- czar
• cend- cent
• centimetr- centimeter
• cenzur- censorship
• ceremoni- ceremony
• cidr- cider
• cigan- gypsy
• cikut- water hemlock
• cilindr- cylinder
• cirk- circus
• citadel- citadel
• civil- civil
• ĉek- cheque
• deficit- deficit
• definitiv- definitive
• dekan- dean
• deklam- declaim
• deklar- declaration
• dekolt- expose neck and shoulders
• dekret- decree
• deleg- delegate
• depeŝ- dispatch
• desert- dessert
• despot- despot
• destin- destiny
• diadem- diadem
• diafragm- diaphragm
• diagnoz- diagnosis
• diagonal- diagonal
• diakon- deacon
• dialekt- dialect
• dialog- dialog
• diametr- diameter
• diet- diet
• difterit- diphtheria
• diftong- diphthong
• dinasti- dynasty
• diplom- diploma
• direktor- director
• disenteri- dysentery
• disk- disk
• diskret- discreet
• diskut- discussion
• dispepsi- dyspepsia
• distanc- distance
• divizi- division
• dog- mastiff
• doktrin- doctrine
• dolar- dollar
• doz- dose
• dragon- dragoon
• dram- drama
• dromedar- dromedary
• duel- duel
• duet- duet
• dukat- ducat
• ebri- drunkenness
• Eden- Eden
• egid- aegis
• ego- ego
• eklezi- church
• ekonomi- economy
• ekskrement- excrement
• eksperiment- experiment
• eksport- exportation
• ekspres- express courier
• ekstaz- ecstasy
• ekstrakt- extract
• ekvator- equator
• ekzem- eczema
• elegant- elegant
• elegi- elegy
• elektr- electricity
• element- element
• eliksir- elixir
• elips- ellipse
• elizi- elision
• emancip- emancipate
• emblem- emblem
• emulsi- emulsion
• enket- inquiry
• epidemi- epidemic
• epiderm- epidermis
• epigraf- epigraph
• epigram- epigram
• epilepsi- epilepsy
• epilog- epilog
• epitet- epithet
• epizod- episode
• epope- epic
• estetik- aesthetics
• estrad- platform
• etik- ethics
• etiologi- aetiology
• evangeli- gospel
• eventual- contingency
• evident- evident
• ezofag- esophagus
• faksimil- facsimile
• fakt- fact
• fakultat- faculty
• fantazi- phantasy
• farmaci- pharmaceutics
• fars- farce
• fasad- facade
• fatal- fate
• faz- phase
• fazeol- bean
• federaci- federation
• felieton- feuilleton
• fenomen- phenomenon
• feston- festoon
• fetiĉ- fetish
• fiask- fiasco
• fiks- fixed
• fiktiv- fictitious
• filantrop- philanthropist
• filantropi- philanthropy
• filolog- philologist
• filologi- philology
• filozof- philosopher
• filozofi- philosophy
• final- finale
• financ- finance
• fiziologi- physiology
• fizionomi- physiognomy
• fleksi- inflexion
• fonetik- phonetics
• format- format
• formul- formula
• frakci- fraction
• fraz- sentence, phrase
• fregat- frigate
• frit- frying
• frivol- frivolous
• fronton- pediment
• funkci- function
• furi- fury
• galer- galley
• galop- gallop
• gangli- ganglion
• gangren- gangrene
• gardeni- gardenia
• garnizon- garrison
• gaz- gauze
• geni- genius
• geologi- geology
• geometri- geometry
• gerani- geranium
• gerundi- gerund
• gigant- giant
• gilotin- guillotine
• gimnastik- gymnastics
• girland- garland
• glicerin- glycerine
• gliciriz- liquorice
• glikoz- glucose
• gondol- gondola
• grafologi- graphology
• gram- gram
• grandioz- grandiose
• gulden- guilder
• ĝeneral- generality
• hamak- hammock
• harmoni- harmony
• harpun- harpoon
• he eh!
• hekatomb- hecatombe
• hektar- hectare
• herold- herald
• hiacint- hyacinth
• hidrofobi- hydrophobia
• hien- hyena
• higien- hygiene
• himn- hymn
• hipopotam- hippopotamus
• hipotek- mortgage
• hipotez- hypothesis
• histeri- hysteria
• hoboj- oboe
• homeopati- homeopathy
• homonim- homonym
• horizont- horizon
• hospital- hospital
• human- humane
• ideal- ideal
• ident- identity
• idiot- idiot
• ilustr- illustrate
• iluzi- illusion
• imperial-
• impon- impressive
• import- importation
• impost- tax
• improviz- improvisation
• impuls- impulse
• individu- individual
• infanteri- infantry
• inform- piece of information
• inkognit- incognito
• inkvizici- inquisition
• inkvizitor-
• insist- insistence
• inspektor- inspector
• instinkt- instinct
• instrument- instrument
• inteligent- intelligence
• interpret- interpretation
• invalid- invalid
• iris- iris
• ironi- irony
• istm- isthmus
• jaguar- jaguar
• jezuit- Jesuit
• jod- iodine
• jubile- jubilee
• junk- rush
• ĵargon- lingua franca
• Kabal- cabal
• kabl- cable
• kadavr- cadaver
• kadenc- cadence
• kadet- cadet
• kaj- AND operator
• kaka- cocoa bean
• kalendar- calendar
• kamarad- comrade
• kameli- camellia
• kanal- channel
• kandidat- candidate
• kanibal- cannibal
• kanon- canon
• kanonik- canon
• kantat- cantata
• kapital- capital
• kaporal- corporal
• karakteriz- characteristic
• karambol- collision
• karat- carat
• karavan- caravan
• karcer- cell
• karn- flesh
• kast- caste
• katafalk- catafalque
• katalepsi- catalepsy
• katalog- catalog
• katastrof- catastrophe
• katedr- pulpit
• kategori- category
• katolik- Roman Catholic
• kaŭĉuk- rubber
• kazern- barracks
• klasik- classic
• klient- client
• kliŝ- negative
• kloak- cesspool
• kobaj- Guinea pig
• koeficient- coefficient
• kofr- coffer
• kokard- cockade
• kolegi- college
• kolik- colic
• kolonel- colonel
• koloni- colony
• kolos- colossal
• kolz- colza
• komedi- comedy
• komet- comet
• komik- comic
• komisar- commissary
• kompani- company
• komparativ-
• kompas- compass
• kompens- compensation
• kompil- compilation
• komplik- complicated
• kompliment- compliment
• kompon- composition
• koncentr- concentrate
• koncert- concert
• konfisk- confiscation
• kontakt- contact
• kontinent- continent
• kontrabas- bass
• kontralt- alto
• kontrapunkt- counterpoint
• kontrast- contrast
• koral- coral
• koridor- corridor
• korne- cornea
• kornet- cornet
• kornik- hooded crow
• korsar-
• korset- corset
• korvet- jackdaw
• kotiz- contribution
• kotlet- chop
• kozak- Cossack
• krab- crab
• kredit- credit
• krest- crest
• krucifiks- crucifix
• kult- cult
• kultur- culture
• kupe- compartment
• kupon- coupon
• kurioz- curious
• kurs- course, class
• kursiv- italics
• kvadrat- square
• kvalit- quality
• kvint- fifth
• kvintesenc- quintessence
• labirint- labyrinth
• lanc- lance
• larik- larch
• latun- brass
• lavend- lavander
• lazur- azure
• letargi- torpidity
• lice- grammar school
• lirik- lyric
• list- list
• litograf- to lithograph
• liturgi- liturgy
• logik- logic
• lojal- loyal
• lokomobil- traction engine
• loteri- lottery
• madon- Madonna
• magnetism- magnetism
• mahagon- mahogany
• makaron- macaroon
• makaroni- macaroni
• malv- mallow
• mandat- mandate
• mandolin- mandolin
• mani- addiction
• manifest- manifesto
• manuskript- manuscript
• margarin- margarine
• marĝen- margin
• marionet- marionette
• markiz- marquis
• marmelad- marmelade
• martir- martyr
• masaĝ- massage
• matematik- mathematics
• materi- matter
• mazurk- mazurka
• medicin- medicine
• meduz- jellyfish
• melas- molasses
• melodi- melody
• melodram- melodrama
• menu- menu
• metafizik- metaphysics
• metafor- metaphor
• metamorfoz- metamorphosis
• metod- method
• miasm- miasma
• miaŭ- mew
• miliard- billion
• mimik-
• minaret- minaret
• mineral- mineral
• miniatur- miniature
• ministr- minister
• mirakl- miracle
• miriad- myriad
• mit- myth
• mitologi- mythology
• mitr- mitre
• mobiliz- mobilization
• modern- modern
• modul- modulus
• molekul- molecule
• molusk- mollusc
• monolog- monologue
• monopol- monopoly
• moral- moral
• morfin- morphine
• mosk- musk
• moske- mosque
• motiv- motive
• motor- motor
• mumi- mummy
• munici- munitions
• muz- muse
• muze- museum
• naft- oil
• narkotik- narcotic
• nav- nave
• negr- black
• nektar- nectar
• nerv- nerve
• nikel- nickel
• nimf- nymph
• nod- knot
• normal- normal
• nostalgi- nostalgia
• novel- novelette
• nunci- nuncio
• oaz- oasis
• oblikv- slash
• ocean- ocean
• od- ode
• ogiv-
• omnibus- omnibus
• oper- opera
• operaci- operation
• opi- opium
• optik- optical
• optimist- optimist
• orator- speaker
• organ- organ
• organism- organism
• organiz- organization
• origin- origin
• original- original
• orkestr- orchestra
• ortografi- orthography
• ovaci- ovation
• pacient- patient
• paĉul- patchouli
• palisandr- rosewood
• palt- overcoat
• pantomim- pantomime
• parafin- paraffin
• paragraf- paragraph
• parlament- parliament
• parodi- travesty
• paroksism- paroxysm
• pasiv- passive voice
• paskvil- pasquinade
• patos- passion
• patriot- patriot
• patron- patron
• pedal- pedal
• pedant- pedant
• pedel- beadle
• penc- penny
• pepsin- pepsin
• percept- perception
• period- period
• perspektiv- perspective
• peruk- wig
• pian- piano
• pigme- pygmy
• pilgrim- pilgrimage
• piramid- pyramid
• pirat- pirate
• platan- platanus
• pneŭmatik- pneumatics
• podagr- gout
• poem- poem
• poet- poet
• poezi- poetry
• polemik- polemic
• politik- politics
• polk- polka
• pomad- pomade
• por- pore
• poz- pose
• pozici- position
• pozitiv- positive
• prefekt- commissioner
• prelat-
• prelud- prelude
• prism- prism
• problem- problem, trouble
• procesi- procession
• profesor- professor
• profil- profile
• prognoz- prognosis
• program- program
• projekci- projection
• prolog- prolog
• propagand- propaganda, publicity
• proporci- proportion
• prospekt- prospectus
• protekt- protection
• protest- protest
• protokol- minutes
• providenc- providence
• provizor- provisional
• proz- prose
• prozodi- prosody
• psalm- psalm
• puding- British-style dessert pudding
• pulĉinel-
• puls- beat
• pupitr- desk
• pustul- pustule
• rabarb- rhubarb
• rabi- rabies
• raci- reason
• radikal- radical
• raket- flare
• ras- breed
• real- reality
• rebus- puzzle
• recept- recipe
• redakt- editing
• ref- reef
• Reformaci-
• refut- disproof
• reklam- advertisement
• relief- relief
• rendevu- appointment
• repertuar- repertoire
• reputaci- reputation
• respublik- republic
• retorik- rhetoric
• retort- retort
• revoluci- revolution
• revolver- revolver
• rezed- mignonette
• rezon- reasoning
• ricin- castor-oil plant
• ripar- repair
• rism- ream
• ritm- rhythm
• rojalist- royalist
• rol- role
• roman- novel
• romb- rhombus
• rubl- ruble
• rubus- blackberry
• rut- rue
• rutin- routine
• sabr- sabre
• sakrament- sacrament
• sald- balance
• saliv- saliva
• sandal- sandal
• santal- sandalwood
• sarkasm- sarcasm
• satan- Satan
• satir- satire
• satrap- satrap
• sekci- section
• sekreci- secretion
• sekundant-
• seminari- seminary
• senat- senate
• sfer- sphere
• simbol- symbol
• simetri- symmetry
• simfoni- symphony
• simpati- sympathy
• sinkop- syncopation
• sinod- synod
• sinonim- synonym
• sintaks- syntax
• siren- siren
• skarlatin- scarlet fever
• skelet- skeleton
• skeptik- skeptical
• skerc- scherzo
• skism- schism
• sociologi- sociology
• sod- soda
• sofist- sophist
• sole- Solea
• solidar- jointly responsible
• solist- soloist
• somnambul- sleepwalker
• sonat- sonata
• sonet- sonnet
• spad- rapier
• specimen- specimen
• spektakl- spectacle
• spiral- spiral
• spiritist- spiritist
• sport- sport
• stadi- stage
• statistik- statistics
• statu- statue
• statur- stature
• stearin-
• strigl- curry-comb
• strof- verse
• struktur- structure
• stud- study
• subtil- subtle
• suflor- prompter
• sultan- sultan
• superlativ-
• sutan- soutane
• svarm- swarm
• ŝanc- chance, luck
• ŝankr-
• ŝarad- charade
• ŝiling- shilling
• ŝovinism- chauvinism
• ŝovinist- chauvinist
• taksus- yew
• takt- tact
• taktik- tactics
• taler- taler
• tanin- tannin
• tapiok- tapioca
• tarif- tariff
• task- task
• tatu- tattoo
• telefon- telephone
• telegram- telegram
• temperament- temperament
• temperatur- temperature
• templ- temple
• tendenc- tendency
• teni- tape-worm
• tenor- tenor
• teolog- theologist
• teologi- theology
• terapi- therapy
• tercet- trio
• termit- termite
• termometr- thermometer
• tif- typhoid fever
• tip- archetype
• tipografi- typography
• tiran- Tirana
• titan- Titan
• tomat- tomato
• tonsur- tonsure
• torent- torrent
• torped- torpedo
• tradici- tradition
• tragikomedi- tragicomedy
• traktat- treaty
• transit- transit
• tribunal- tribunal
• tribut- tribute
• triumf- triumph
• trup- troop
• tunel- tunnel
• turist- tourist
• unison-
• uragan- hurricane
• urĝ- craving
• utopi- utopia
• uvertur- overture
• vak- vacant
• vampir- vampire
• vanel- lapwing
• velociped- velocipede
• verand- veranda
• verben- verbena
• verdikt- verdict
• veteran- veteran
• veterinar- veterinarian
• vibr- vibration
• vinjet- vignette
• vink- periwinkle
• visk- mistletoe
• vist- whist
• vulgar- vulgar
• zigzag- zigzag
• zodiak- zodiac
• zuav- Zouave

Counts follow the officiality marks in Reta Vortaro (ReVo); the Academy of Esperanto keeps the official list in its Akademia Vortaro, and its own counts differ by a few roots. Words built from official roots are normal Esperanto even when they are not on any list: see Word building. Academy.