rational Copy link Outline I. Possessing reason1. expr. by rătio, mens, ănĭmus, under government of an adj.2. rătiōnālis, e, late3. intelligens, ntis (denoting something more than precedd., and implying the active exercise of reason)II. Agreeable to reason1. consentāneus (lit. agreeable; i. e. to reason)2. prŏbābĭlis, e (that commends itself to one's judgment)3. expr. to be r., by convĕnio, vēni, 4 (to agree, hold together) • rational: I. Possessing reason: 1. expr. by rătio, mens, ănĭmus, under government of an adj.: e. g. rationis particeps (opp. expers), Cic. Off. 1, 4, 11: cf. Leg. 2, 7, 16: animo praedĭtus, Cic. N. D. 1, 8, 18. So with a verb, to be r., rationem habere, ib. 3, 10, 26, and Leg. l. c. 2. rătiōnālis, e, late: all animals are either r. or irrational, omnia animalia aut r. aut irrationalia, Sen. Ep. 113, 14: Quint. 8, 6, 13. 3. intelligens, ntis (denoting something more than precedd., and implying the active exercise of reason): v. intelligent. Phr.: to be conscious and r., sentire atque intelligere, Cic. N. D. 2, 15, 29. II. Agreeable to reason: 1. consentāneus (lit. agreeable; i. e. to reason): it is r. (to suppose) that they are possessed of sense and understanding, c. est in iis sensum inesse et intelligentiam, Cic. N. D. 2, 15, 42. 2. prŏbābĭlis, e (that commends itself to one's judgment): that of which a r. account may be given, cujus p. ratio reddi potest, Cic. Fin. 3, 17, 58. 3. expr. to be r., by convĕnio, vēni, 4 (to agree, hold together): it is by no means r., minime convenit, Cic. Fin. 3, 20, 66. (N.B.--Rationabilis occurs in both senses, viz. I. and II., but is late and rare.)