Lewis Short
ăpertĭo (noun F) : id.
* An opening, unfolding (only ante- and post-class.).
* With gen.: floris,Pall. 1, 6, 4: templi,App. M. 11, p. 266, 22: oris,Vulg. Eccli. 20, 15; ib. Ephes. 6, 19.
* Absol.: cum periculo introitur recenti apertione,Varr. R. R. 1, 63: apertio,the solemn opening of a temple,Serv. ad Verg. A. 4, 301.
Charlton T. Lewis, Charles Short, A Latin Dictionary