Words followed by an * or ? are either non-canon or non-verified
| o | |
| oath (n) | 'IP |
| obey (v) | LOB |
| object, gripe, complain (v) | BEP |
| obliterate (v) | SAF |
| observe, celebrate (a ritual) (v) | LOP |
| observe, notice, discover, find (v) | TU' |
| obsolete, be obsolete (v) | NOX |
| obstruct (v) | WAQ |
| obstructed (not), be not obstructed, be clear (v) | HUV |
| obtain, acquire, get (v) | SUK |
| -obviously (v-6) e.g., NEPWI' DABA' - he/she is obviously lying. | -BA' |
| occasionally, sometimes (adv) | RUT |
| occupy (military term) (v) | DAN |
| occur, happen (v) | KAS |
| occurrence, phenomenon, event (n) | WANI' |
| ocean (n) | BIQ'A' |
| odd, be odd (v) | JUM |
| odour (n) | PIW |
| offend (v) | MAW |
| officer (n) | YAS |
| offspring, child (n) | PUK |
| often, frequently (adv) | PIJ |
| Okay! I will! Yes! (excl) | LUK |
| Okay! I will! Yes! (excl) | LU' |
| old, be old (not new) (v) | FO' |
| omit (v) | NOP |
| on purpose, intentionally, purposely (adv) | CIC |
| on, at, in, to, with-in [SEE -locative (n-5)] | (-DAK) |
| once (adv) | WA'LOG |
| -one another (v-1) e.g., MAKIPCUK - We hit each other (‘no object' prefix must be used as well as plural subjects). | -CUK |
| one in authority or in charge, authority, power (n) (slang) | FUP |
| one, 1 (num) | WA' |
| -oneself (v-1) e.g., BILIH'EG - You introduce yourself. (prefix for no object must be used). | -'EG |
| only, merely, just, alone (adv) If after a noun it trivialises it taking on a meaning of only/merely/ just. If after a verb it means only/alone. | NEH |
| open (v) | POSMOH |
| open, be open, opened (v) | POS |
| open/flat hand (n) | GIT |
| opened, be opened, open (v) | POS |
| opening, chance, opportunity (n) | 'EB |
| opera (n) | GE'NAQ |
| operate, be in operation (v) | QAP |
| operation; be in operation, operate (v) | QAP |
| opinion (n) | VUD |
| opponent, adversary (n) | GOL |
| opportunity, chance, opening (n) | 'EB |
| oppose, resist, confront, face, challenge (v) | KAD |
| option, possibility (n) | DUH |
| or, and/or (joining nouns [after]) (conj) | JOK |
| or, and/or (joining sentences) (conj) | KOJ |
| or, either/or (joining nouns[after]) (conj) | GAP |
| or, either/or (joining sentences) (conj) | PAG |
| orange, be orange, red (v) | DOK |
| orbit (v) | BAV |
| order, command (n) * | RA' |
| order, command (v) | RA' |
| order, group officially recognised by government (n) | 'OBE' |
| Order of the Bat'leth (n) The highest honour that the High Council can bestow on a Klingon (p182 KGT) | BETLEH 'OBE' |
| order, structure (societal) (n) (slang) | XAM |
| ordinals numbers (num el) e.g, 1st 2nd 3rd - WA'DIC CA'DIC WEJDIC | -DIC |
| Organia (n) | 'ORGEN |
| Organia (n) | 'ORGENYA' |
| Organian (n) | 'ORGEFAN |
| Organian (n) | 'ORGENYA'FAN |
| Organian Peace Treaty (n) | 'ORGEN ROJMAB |
| Organian Peace Treaty (n) | 'ORGENYA' ROJMAB |
| organisation, association, league, union, federation (n) | DIVI' |
| organism (n) | YAG |
| origin (n) | MUF |
| ornament; ancestor hanging (wall ornament) (n) | NO' DIR |
| others, extras (n) * | LAXMEY |
| -our (n-4) (see also -MA' ) | -MAJ |
| -our (noun capable of using language) (n-4) (otherwise use -MAJ). | -MA' |
| out (get), flee (v) | HAW' |
| out (take out), get out (v) | LEL |
| outer (v) | KOG |
| outside (n) | HUR |
| outsider, alien, foreigner (n) | NOV |
| outsider, foreigner (n) (slang) | HUR'IK |
| over there, thereabouts, there (n) | PA' |
| overhead (area), area above (n) | DUF |
| overly, to an excessive degree, too much (adv) e.g., XOY JISOP - I eat too much. See also 'IK - be too many [KEP'A' JAVDIC] | XOY |
| override (v) | FEP |
| overripe, be overripe, be ripe (fruit, vegetable) (v) | DEH |
| overtake, pass (v) | JUS |
| oxygen (n) | YINSIP |