ning, introduction, outset; vacancy.

openly, adv. publicly, unreservedly, candidly.

open-mouthed, a. gaping, yawning; greedy, clamorous, ravenous,
rapacious, eager.

opiate, n. narcotic, anodyne, sedative, dormitive, soporific.

opiate, a. somniferous, narcotic, anodyne, sedative, soporiferous,
dormitive.

opinion, n. belief, judgment, impression; decision, ruling, verdict,
sentence.

opium, n. Associated Words: narcotic, opiate, chandoo, thebaine,
narcotine, codeine, dope, meconism, meconology, meconophagism,
meconophagist, opiophagism.

opponent, n. adversary, antagonist, rival, competitor.

opportune, a. timely, seasonable, apropos, felicitous, appropriate.

oppose, v. combat, resist, confront, withstand, oppugn, impugn,
contend, antagonize, contravene, discountenance, gainsay, contradict.
Antonyms: yield, acquiesce, concur, agree.

opposer, n. opponent, antagonist.

opposing, a. conflicting, antagonistic, contending, opposite,
adverse.

opposite, n. antithesis, counterpart, antipodes.

opposite, a. contrary, adverse, diametrical, antagonistic, inverse,
reverse, contradictory, counter, incompatible, antithetic, antipodal,
inconsistent.

opposition, n. resistance, counteraction, hostility, repulse, rebuff,
recalcitration, counterview, antagonism, contradiction, obstacle,
impediment, obstruction. Antonyms: acquiescence, non-resistance,
concurrence, agreement.

oppress, v. burden, overwhelm, aggrieve, tyrannize, persecute,
overpower.

oppression, n. tyranny, persecution, extortion, hardship, severity.

oppressive, a. rigorous, tyrannical, extortionate, burdensome.

oppressor, n. tyrant, persecutor, extortioner.

option, n. choice, preference, election, discretion, alternative.
Antonyms: constraint, coercion, compulsion.

optional, a. discretional, elective. Antonyms: compulsory,
coercive, obligatory.

oral, a. spoken, verbal, parole, vocal, nuncupative.

oration, n. declamation, rhetoric.

orator, n. declaimer, rhetorician.

oratorical, a. rhetorical, eloquent, declamatory.

ordeal, n. crucible.

order, n. mandate, command, precept, direction, decree, decretal,
injunction; rule, regulation, law, canon, prescription; method, system,
disposition, arrangement; succession, sequence; dictation, bidding,
commission; grade, degree, class; tranquillity, quiet.

order, v. methodize, systematize, regulate; bid, command, dictate,
enjoin.

ordering, n. distribution, disposition, regulation.