1. To make or to get (something) ready; to prepare: “Beginning in 1803, it took the Lewis and Clark Expedition months to apparel fully for its journey into unknown regions of North America.”
2. Etymology: "to equip", from Old French apareillier, from Vulgar (Common) Latin appariculare, from Latin apparare "to prepare, to make ready".

This term comes either from Latin apparare, "to prepare, to make ready"; or from Common Latin, ad + particulare, "to put things together".