certain Copy link Outline I. Undoubted, sure (objective)1. certus2. explōrātus (of the future)3. rătusII. Convinced, believing firmly (subjective)III. Particular, but undefined1. quīdam, quaedam, quoddam2. certus (more definite than quidam; and implying that the speaker could mention names if disposed to do so) • certain: I. Undoubted, sure (objective): 1. certus: a more c. fact, certior res, Liv.: to consider as c., certum habere or, pro certo habere, Cic.: v. also unfailing. 2. explōrātus (of the future): a c. victory, ex. victoria, Caes.: who is so foolish as to thing it c. he will live till evening? quis est tam stultus, cui sit exploratum se ad vesperum esse victurum? Cic. 3. rătus: v. fixed. Phr.: to know for c., certo (better than certe) scire, Cic.; Ter.: also, manu s. manibus tenere (cf. manifestus: manus, fero); compertum habere, Sall. (stronger than comperisse): it is c., constat, stĭtit, 1: v. agreed on. II. Convinced, believing firmly (subjective): certus (rare): are you any more c. now? numquid nunc es certior? Pl.: to be c. about anything, de aliqua re c. esse. Suet.: Gell. (but probably not in Cic.: cf supr 1.). III. Particular, but undefined: 1. quīdam, quaedam, quoddam: a c. soldier, quidam ex militibus, Caes.: at a c. time, quodam tempore, Cic.: c. of these went to the Nervii, quidam ex his ad Nervios pervenerunt, Caes. 2. certus (more definite than quidam; and implying that the speaker could mention names if disposed to do so): he has c. persons in his interest, habet certos sui studiosos. Cic.: bound by c. laws of speaking, ad certas quasdam dicendi leges alligatus, Quint.