bĭennĭum (noun N) : bis-annus
* A period or space of two years, two years: jam biennium est, cum, etc., Plaut. Merc. 3, 1, 35: intra tempus biennii,Col. 3, 9, 6: hoc factum est ferme abhinc biennium,Plaut. Bacch. 3, 2, 4 (imitated by Ps.-Plaut. Merc. prol. 12): biennium ibi perpetuum misera illum tuli,Ter. Hec. 1, 2, 12; Caes. B. G. 1, 3; Cic. Phil. 5, 3, 7; Liv. 5, 14, 2: biennium provinciam obtinuit,Cic. Verr. 2, 3, 93, § 216; 2, 4, 30, § 67: lex usum et auctoritatem fundi jubet esse biennium,id. Caecin. 19, 54; Quint. Ep. ad Tryph. 1; id. Inst. 1, 12, 9: biennio postquam abii,Plaut. Bacch. 2, 1, 1: comitia biennio habita,Liv. 5, 14, 2: matres, quae biennio durant,Plin. 11, 21, 24, § 73; Suet. Galb. 7: consulatum biennio post ultro petiit,id. Aug. 26: intra tempus bienni,Col. R. R. 3, 9, 6: intra biennium,Quint. 1, 2, 9: ultra biennium,Tac. A. 1, 1.

s. TLL