I. In gen.: observationi operam dare, Plaut. Mil. 2, 6, 5: siderum, Cic. Div. 1, 1, 2.—As a gift or faculty, the power of observation, Plin. 18, 29, 69, 284.—

II. In partic.

A. An office, duty, service (eccl. Lat.): Dei sui et expiationis, Vulg. 2 Esdr. 12, 44: in observationibus sicut fas est, id. 1 Macc. 12, 11.—

B. An observation, remark; a precept, rule (post-Aug.), Plin. 17, 21, 35, 163: dare observationes aliquas coquendi, id. 22, 23, 47, 99: sermonis antiqui, Suet. Gram. 24.—

C. In partic., circumspection, care, exactness: summa erat observatio in bello movendo, Cic. Off. 1, 11, 36.—

D. Regard, respect, esteem, reverence (post-class.): religionibus suam observationem reddere, Val. Max. 1, 1, 8: Christianitatis, Cod. Th. 12, 1, 112: divina, ib. 12, 1, 104.—

E. Display, outward show (eccl. Lat.): non venit regnum Dei cum observatione, Vulg. Luc. 17, 20.—

F. Observance: dierum, Gell. 3, 2, 3.