Dua Oficiala Aldono (2OA): the 586 official roots
All 586 roots made official by Dua Oficiala Aldono (2OA) (1919), alphabetically, with their meaning in English and a link to each dictionary entry.
- abnegaci- renunciation
- abrupt- abrupt
- adici- addition
- agit- agitate
- akapar- ??? angla traduko ???
- akcident- accident
- akrobat- acrobat
- akut- acute
- akvilegi- columbine
- ald- alto
- alg alga
- alĥemi- alchemy
- alibi- alibi
- aline- paragraph
- alternativ- alternative
- ametist- amethyst
- amfiteatr- amphitheater
- amortiz- amortization
- amulet- amulet
- anagal- pimpernel
- anagram- anagram
- anakronism- anachronism
- anapest- anapest
- aneks- annexation
- anemon- anemone
- angelik- angelica
- anomali- anomaly
- antitez- antithesis
- antologi- anthology
- aort- aorta
- api- wild celery
- apostrof- apostrophe
- apoteoz- apotheosis
- apozici- apposition
- arabesk- arabesque
- arbalest- crossbow
- arnik- leopard's bane
- arteri- artery
- asimil- assimilation
- asonanc- assonance
- asperg- spraying
- atavism- atavism
- ateism- atheism
- atlas- atlas
- aŭditori- auditorium
- aŭtobiografi- autobiography
- aŭtograf- autograph
- aŭtokrat- autocrat
- azil- asylum
- bacil- bacillus
- bakteri- bacterium
- balad- ballad
- balistik- balistics
- balon- balloon
- balot- vote
- balzam- balm
- balzamin- impatiens
- banal- banal
- banan- banana
- bandaĝ- bandage
- bandit- bandit
- barak- barracks
- barikad- barricade
- basen- basin
- batist- batiste
- bazalt- basalt
- bazilik- basilica
- beril- beryl
- bibliografi- bibliography
- bilard- pool
- biografi- biography
- bisturi- bistoury
- bojkot- boycott
- bomb- bomb
- bosk- grove
- bracelet- bracelet
- braman- Brahmin
- breĉ- breach
- brigad- brigade
- brokant- second hand
- bronk- bronchial tube
- bronkit- bronchitis
- burlesk- burlesque
- burnus- burnous
- celeri- celery
- celuloz- cellulose
- centigram- centigram
- centilitr- centiliter
- cidoni- quince
- cikad- cicada
- cikl- cycle
- ciklon- cyclone
- ciklop- cyclops
- cinik- Cynic
- cirkumfleks- circumflex
- ĉar- chariot, wagon, cart
- dali- dahlia
- debat- debate
- decigram- decigram
- decilitr- deciliter
- decimal- digit after the radix point
- decimetr- decimeter
- dekagram- decagram
- dekalitr- decaliter
- dekametr- decameter
- demagog- demagogue
- demokrat- democrat
- demonstrativ- demonstrative
- departement- administrative department
- determin- determination
- diabet- diabetes
- diafan- diaphanous
- dialektik- dialectic
- diant- carnation
- diapazon- tuning fork
- didaktik- didactics
- diktator- dictator
- dilem- dilemma
- dinamik- dynamics
- dinamit- dynamite
- dinamometr- dynamometer
- disciplin- discipline
- ditiramb- dithyramb
- divan- divan
- draĥm- drachma
- dualism- dualism
- duŝ- shower
- ebur- ivory
- ekip- equipage
- eklog- eclogue
- eksces- excess
- ekskluziv- exclusive
- ekskomunik- excommunication
- ekspluat- exploit
- ekvaci- equation
- ekvilibr- equilibrium
- elf- elf
- enciklopedi- encyclopedia
- endivi- endive
- entomologi- entomology
- Epifani- Epiphany
- erik- heath
- erizipel- erysipelas
- eskort- escort
- etimologi- etymology
- etnografi- ethnography
- eŭĥaristi- eucharist
- eŭnuk- eunuch
- evolu- evolution
- fakir- fakir
- faktor- agent
- falang- phalanx
- familiar- familiar
- fanatik- fanatical
- fanfar- fanfare
- feminism- feminism
- feminist- feminist
- feniks- phoenix
- feŭd- fief
- fiakr- hackney coach
- fjord- fjord
- floren- florin
- fonograf- phonograph
- formal- formal
- forum- forum
- fresk- fresco
- fris- frieze
- fuk- jetsam
- galant- snowdrop
- galantin- gallantine
- garnitur- garniture
- garol- jay
- gem- gem
- genealogi- genealogy
- geodezi- geodesy
- gimnazi- grammar school
- gladiator- gladiator
- glazur- glaze
- gnom- gnome
- goril- gorilla
- gotik- gothic style
- grafit- graphite
- grip- the flu
- grog- grog
- grotesk- the grotesque
- grumbl- grumble
- guberni- administrative province
- gutaperk- gutta-percha
- ĝendarm- gendarme
- ĝin- gin
- halebard- halberd
- harem- harem
- harmonik- harmonica
- harmonium- pump organ, harmonium
- harpi- harpy eagle
- hazard- accident
- heksametr- hexameter
- hektogram- hectogram
- hektolitr- hectoliter
- hektometr- hectometer
- helik- snail
- heliotrop- heliotrope
- hermafrodit- hermaphrodite
- hetman- hetman
- hidr- Hydra
- hidrostatik- hydrostatics
- hidroterapi- hydrotherapy
- hieroglif- hieroglyphics
- higrometr- hygrometer
- hipertrofi- hypertrophy
- hipodrom- hippodrome
- hisop- hyssop
- horoskop- horoscope
- hortensi- hortensia, hydrangea
- humer- humerus
- idiom- idiom
- ignor- ignore
- ileks- holly
- imperativ- imperative
- imperfekt- imperfect
- impresari- impresario
- incens- incense
- indikativ- declarative mood
- infinitiv- infinitive
- inkluziv- inclusive
- inspekt- inspection
- instal- install
- instanc- authority
- intendant- superintendent
- irid- iris
- ism- a doctrine, theory, or practice
- kaban- cabin
- kabriolet- convertible
- kalejdoskop- kaleidoscope
- kalendul- marigold
- kalibr- caliber
- kalif- caliph
- kalomel- calomel
- kame- cameo
- kanaben- linnet
- kanton- canton
- karamel- caramel
- kardinal- cardinal
- karikatur- caricature
- kartografi- cartography
- kartuŝ- cartouche
- katakomb- catacomb
- katedral- cathedral
- kaŭci- bail
- kaŭr- crouch
- kazemat- casemate
- kazin- casino
- kep- kepi
- kirŝ- kirsh
- kling- blade
- klinik- clinic
- kodicil- codicil
- kokon- cocoon
- kolodi- collodion
- komplement- complement
- komplet- set
- komplot- conspiracy
- kompot- compote
- kompromis- compromise
- koncept- concept
- konciz- concise
- kondor- condor
- konfederaci- confederation
- konferenc- conference
- konflikt- conflict
- konglomerat- conglomerate
- kongregaci- congregation
- konjak- cognac
- konkav- concave
- konkret- concrete (real
- konservatori- conservatory
- konsistori- consistory
- konstituci- constitution
- konsul- consul
- kontraband- contraband
- konveks- convex
- konvenci- convention
- konvolvul- convolvulus
- korelativ- pro-form, correlative
- korife- coryphaeus
- korsaĵ- bodice
- kosmetik- cosmetics
- kosmogoni- cosmogony
- kosmografi- cosmography
- kosmopolit- cosmopolitan
- krabr- hornet
- kreol- creole
- kreozot- creosote
- kres- cress
- krestomati- chrestomathy
- kript- crypt
- kriteri- criterion
- krizantem- chrysanthemum
- kronologi- chronology
- kronometr- chronometer
- ksilofon- xylophone
- kulis- slip
- kumin- cumin
- kvadratur- quadrature
- kvadril- quadrille
- kvestor- quaestor
- kvocient- quotient
- lagun- lagoon
- laktuk- lettuce
- lama- lama
- lapis- lunar caustic
- laŭreat- laureate
- legat- legate
- liberal- liberal
- lift- lift
- litr- liter
- logaritm- logarithm
- logogrif- logogriph
- lozanĝ- rhombus
- lucern- Lucerne
- lukt- fight
- majolik- majolica
- major- major
- makadam- macadam
- malakit- malachite
- malari- malaria
- mamut- mammoth
- mandaren- mandarin
- manipul- handle
- manometr- manometer, manoscope, pressure gauge
- mansard- attic
- manufaktur- factory
- marasm- marasmus
- marin- marinate
- matador- matador
- maŭzole- mausoleum
- medikament- medicine
- medium- medium
- melis- melissa
- mentor- mentor
- meridian- meridian
- merlang- whiting
- mespil- medlar
- metempsikoz- metempsychosis
- meteor- shooting star
- meteorologi- meteorology
- metrik- metric
- metronom- metronome
- metropol- metropolis
- mikrob- microbe
- mikrofon- microphone
- mikrometr- micrometer
- mikroskop- microscope
- mild- gentle
- miligram- milligram
- milimetr- millimeter
- milv- kite
- mimoz- sensitive plant
- mineralogi- mineralogy
- mirabel- mirabelle
- miriametr- myriametre
- mistik- mysticism
- mitul- common mussel
- monogram- monogram
- monomani- monomania
- monoteism- monotheism
- moru- Atlantic cod
- mozaik- mosaic
- naftalin- naphthalene
- negativ- negative
- neologism- neologism
- nepotism- nepotism
- neŭtr- neuter
- neŭtral- neutral
- nihilism- nihilism
- nihilist- nihilist
- nikotin- nicotine
- nimb- halo
- niz- sparrow-hawk
- noktu- little owl
- nomad- nomenclature
- norm- norm
- numismatik- numismatics
- obelisk- obelisk
- objektiv- objective
- obligaci- bond
- obol- obolus
- oktav- octave
- okult- occult
- oniks- onyx
- onobrik- sainfoin
- opozici- opposition
- optativ- optative
- optimism- optimism
- orgi- orgy
- oriol- oriole
- orkide- orchid
- orografi-
- ortodoks- orthodox
- ostracism- ostracism
- ozon- ozone
- pagod- pagoda
- palanken- palanquin
- paleografi- palaeography
- paleontologi- paleontology
- palinur- spiny lobster
- panik- panic
- panoram- panorama
- panteism- pantheism
- panteist-
- papirus- papyrus
- parabol- parable
- paradigm- paradigm
- paraf- paraph
- parafraz- paraphrase
- paralelogram- parallelogram
- partitur- score
- patologi- pathology
- pavian- baboon
- pension- boarding house
- pentametr-
- peoni- peony
- perimetr- perimeter
- peristil-
- pesimism- pessimism
- pesimist- pessimist
- petard- petard
- piastr- piastre
- pilastr-
- pistil- pestle
- pled- plea
- pleonasm- pleonasm
- pleŭronekt-
- poliglot- polyglot
- polip- polyp
- polis- insurance policy
- politeism- polytheism
- pomp- pomp
- ponton- pontoon
- popular- popular
- pore- leek
- portal- portal
- portik- porch, portico
- premis- premise
- prerogativ- prerogative
- preterit- past tense
- primitiv- primitive
- prior- prior
- procedur- procedure
- propozici- clause
- prostitu- prostitution
- protagonist- protagonist
- protektorat- protectorate
- prototip- prototype
- prozelit- proselyte
- pseŭdonim- pseudonym
- psikolog- psychologist
- psikologi- psychology
- purgatori- purgatory
- puritan- puritan
- racionalism-
- racionalist-
- raj- ray
- recitativ- recitative
- rekord- record
- rektor- rector
- relativ- relative
- renesanc- Renaissance
- respektiv- respective
- retin- retina
- retor-
- reŭmatism- rheumatism
- revu- review
- rezult- result
- rikan- sneer
- rob- dress
- rokok- rococo
- romanc- romance
- romantik- romanticism
- rotond-
- sagu-
- sakristi- sacristan
- salv-
- samovar- samovar
- sarkofag- sarcophagus
- segment- segment
- sekt- sect
- sektor- sector
- semafor- semaphore
- sensaci- sensation
- sentimental- sentimental
- septet-
- seraf- seraph
- serajl- seraglio
- seren- serene
- serenad- serenade
- sevrug-
- sfinks- sphinx
- sfinkter- sphincter
- sifilis- syphilis
- sifon-
- silogism-
- siluet- silhouette
- simptom- symptom
- sinagog- synagogue
- sinap- mustard plant
- sindikat- labor union
- sinedri-
- sinoptik- synopsis
- sintez- synthesis
- skalp- scalp
- skandal- scandal
- skolastik-
- skorzoner-
- skrupul- scrupulousness
- social- social
- sokl- base
- sold- sou
- solecism- solecism
- solid- solid
- sortiment- assortment
- spasm- spasm
- spektr- spectrum
- sperm- semen
- spiritual- spiritual
- sponde- spondee
- stalagmit- stalagmite
- stalaktit- stalactite
- stimul- stimulation
- stoik- stoic
- strategi- strategy
- striknin- strychnine
- stult- stupidity
- subjektiv- subjective
- subjunktiv- subjunctive
- substanc- substance
- ŝah- shah
- ŝalup- longboat
- ŝrapnel- shrapnel
- taburet- stool
- talisman- talisman
- talk- talc
- talmud-
- tamburin- tambourine
- tamtam- tamtam
- tandem- tandem bicycle
- tangent- tangent
- tarantel- tarantella
- tarantul- tarantula
- tarok- taroc
- teism- theism
- teist- theist
- teleskop- telescope
- teokrati- theocracy
- teorem- theorem
- teritori- territory
- tiar- tiara
- tindr- tinder
- tink- tench
- tinktur- tincture
- tog- Lake Togo
- topografi- topography
- toreador-
- tors- torso
- tram- street car
- transept- transept
- transitiv- transitive
- trapez- trapeze
- trigonometri- trigonometry
- trofe- trophy
- trombon- trombone
- trop- trope
- trust- business trust (with intent to monopolize
- tunik- tunic
- turbin- turbine
- turism- tourism
- ukaz- ukase
- ulan- uhlan
- ultimat- ultimatum
- variant- variable
- vazelin- vaseline
- vegetar- vegetarian
- vermut- vermuth
- viadukt- viaduct
- viski- whiskey
- vokativ- vocative case
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.