one: (indefinite pronoun) on; (numeral) un; (one person) unu; (adj. indicating unity) una; (unit) un-o, -ajo; one of the two: l’una o l’altra; to make one: un-igar; neither one nor the other: nek l’una nek l’altra, nula de la du; that is all one: to esas sama (od, identa); one person alone cannot: una sola ne povas; one by one: un-ope; one-eyed: (person) tuert-a, -(ul)o; oneness: un-eso; one-sided: (biassed) partis-ala, -ana; ne-yusta; oneself: su (ipsa); to be at one: konsentar, konkordar; one-colo(u)red: un-kolora (cf. unika).
onerous: opres-anta, -iva, -ema; (costly) kust-oza.
onion: onyono.
only: nur (cf. sola, unika); o. love inspires him: nur l’amo inspiras lu; o. God can: nur Deo povas; not o.: ne nur, ma anke: he o. was there: il sola (od, nur) esas ibe; o. child: unika filio.
onomatopoeia: onomatopeo.
onset, onslaught: atako, asalto.
ontogenesis: ontogenezo.
ontology: ontologio.
onus: karg-ajo; devo.
onward: (ad-)avane; (adj.) avana, avanc-anta, progres-anta; to go o.: avancar.
onyx: onixo.
oocyte: oocito.
oogenesis: oogenezo.
oogonium: oogonio.
oolite: oolito.
oosphere: oosfero.
oospore: oosporo.
ooze: (intr.) exudar, (intr.) flu-etar.
ooze: (slime, silt) slamo.
opacity: opak-eso.
opal: opalo.
opalesce: opalecar (intr.).
opalescence: opalec-(ad)o.
opalescent: opalec-anta, opal-atra; o. glass: opalec-anta vitro.
opaline: opal-atra.
opaque: opaka.
open: apertar (cf. des-klozar); (a ball, dance, fire) komencar (cf. inaugurar); (a bottle) des-stopar.
open: (not shut) apert-ita, des-kloz-ita; (frank) sincera; (free, unrestricted) libera; (of a question) ne-decid-ita; (of weather) ne-severa, dolca; (exposed) expoz-ita (ad); o.-handed: jeneroza; o.-hearted: grand-anma; sincera; o.-eyed: vigil-anta; o.-mouthed: be-anta-a, -e; kun boko apert-ita; o. to an engagement: libera por engajar su; half-opened: mi-apert-ita; wide o.: tote apert-ita; in the o. air: en libera aero; in the o. sea: en meza o larja maro; in the o. day: en meza jorno, en granda lumo; o. shame: publika shamo; to keep o. house: havar la hemo, la domo apertita por (od, ad) la publiko.
opener: (instr.) apert-ilo; (person) -isto.
opening: (chapter, etc.) un-esma; komenc-anta.
opening: (act of o.) apert-o; (aperture) apert-uro (cf. brecho; fend-uro; truo); (commencement) komenco; (first appearance) debuto; (opportunity) okaziono; chanco; (for sale of goods) debit-eyo.
openly: aperte, ne-cel-ate, sincere, honeste, kandide.
opera: oper-o; o. house: -teatro; o. glass: bi-lorn-eto.
operate: (surg., finan., milit.) operacar; (work) (intr.) agar, efikar, funcionar; (in stock markets) spekular.
operation: (math., surg., milit., fin.) operaco; (in gen.) ago, efiko, funcion-ado, procedo.
operative: (n.) mestier-isto, labor-isto, fabrik-anto, -isto; (adj.) ag-iva; (efficacious) efik-anta, -iva, -ema.
operculum: operkulo.
operetta: oper-eto.
ophicleide: ofikleido.
ophite: ofito.
opthalmia: oftalmio; -mic: okul-ala.
opthalmology: oftalmologio.
opthalmoscope: oftalmoskopo.
opiate: opiato, narkot-ig-ivo.
opine: (intr.) opinionar, expresar (sua) opiniono.
opinion: opinion-o; to be of the o.: -ar, havar ta opiniono; to have high o. of: bone o favore opinionar pri (ulu, ulo); in the o. of: segun la opiniono di.
opinionated: obstin-anta, -ema.
opium: opiumo.
opodeldoc: opodeldoko.
opossum: sarigo.
opponent: antagonisto, adverso; opoz-anto, -ero; (collect.) -ant-aro.
opportune: oportuna; -ness: -eso.
opportunism: oportun-ismo.
opportunist: oportun-isto, -ista.
opportunity: (occasion) okaziono; (favo(u)rable circumstance) oportun-ajo; (chance, luck) chanco; take, seize the o.: prenar, kaptar la okaziono; o. makes the thief: l’okaziono facas la furt-anto, od, l’okaziono sugestas krimino.
