Lewis Short
observantĭa (noun F) : observo
* A remarking, noting, regard, observance.
* In gen.: temporum observantia,Vell. 2, 1063.
* In partic.
* Observance, attention, respect, regard, reverence shown to another: observantia est, per quam aetate, aut sapientiā, aut honore, aut aliquā dignitate antecedentes veremur et colimus,Cic. Inv. 2, 22, 65: officia observantiamque dilexit,id. Balb. 28, 53: tenuiorum,id. Mur. 34, 71: amicos observantiā, rem parsimoniā retinere,id. Quint. 18, 59: observantia, quā me colit,id. Fam. 12, 27, 1: in regem,Liv. 1, 35: eadem pro libertis adversus patronos,Quint. 11, 1, 66.
* An obedient observance; a keeping, following, performing of laws, customs, etc.: prisci moris observantia,Val. Max. 2, 6, 7: juris,Dig. 1, 2, 2.
* An observance of religious duties, divine worship, religion: fides Catholicae observantiae, Cod. Th. 16, 5, 12, § 54: religio et observantia,Vulg. 2 Macc. 6, 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary