Lewis & Short

conservātĭo, ōnis, f. [conservo], a keeping, preserving (several times in Cic.; elsewh. very rare): frugum, Cic. Off. 2, 3, 12: Marii, i. e. of his life, Val. Max. 2, 10, 6.
Trop.: bonorum, * Quint. 5, 10, 33: patriae, Num. Gallieni ap. Eckhel. 7, p. 408: naturae (with convenientia), Cic. Off. 1, 28, 100: decoris, id. ib. 1, 36, 131: aequabilitatis, id. de Or. 1, 42, 188.