Obvenire, see [Accidere].
[Occasio]; Opportunitas; Potestas; Copia; Facultas. Occasio and opportunitas are the opportunities which fortune and chance offer; occasio, the opportunity to undertake something in a general sense, like καιρός; opportunitas, the opportunity to undertake something with facility and the probability of success, like εὐκαιρία; whereas potestas and copia are opportunities offered by men, and through their complaisance; potestas denotes the possibility of doing something with legal authority; copia the possibility of doing something with convenience; lastly, facultas, as the most general expression, the possibility to do something in a general sense.
Occidere, see [Interficere].
Occulere, Occultare and Occulte, see [Celare].
Oculi, see [Facies].
[Odium]; Invidia; Inimicitia; Simultas. 1. Odium and invidia denote the feeling of aversion; inimicitia and simultas, the exterior state arising from this feeling. 2. Invidia has a negative character, like disaffection, like δύσνοια, and is a temporary feeling, in opp. to gratia or favor; whereas odium (from ὀδύσασθαι) has a character thoroughly positive, like hatred, μῖσος, and is a deep-rooted feeling, in opp. to amor. Plin. Pan. 68, 7. Hence, invidia is the beginning of odium. Invidia has merely persons; odium, persons and things for its objects. Tac. Ann. ii. 56. Armenii . . . sæpius discordes sunt, adversus Romanos odio, et in Parthum invidia. xiii. 15. Nero intellecta invidia odium intendit. Plin. Pan. 84, 2. Exardescit invidia, cujus finis est odium. 3. Inimicitia denotes any enmity which has its foundation in antipathy or disagreement, like δυσμένεια, ἔχθρα; whereas simultas (ὁμαλότης) denotes a political enmity, which has its foundation in rivalship, like φιλονεικία. Suet. Vesp. 6. Simultas quam ex æmulatione non obscuræ gerebant. (iii. 73.)
Odorari, Odorus, see [Olere].
Offendere, see [Lædere].
Offensio, see [Contumelia].
[Officium]; Munus. Officium means an employment, as imposing a moral obligation, undertaken from conscientious feelings; munus, as imposing a political obligation, undertaken merely as a charge or office. Cic. Mur. 35. Hæc sunt officia necessariorum, commoda tenuiorum, munia candidatorum. (v. 352.)