aid(redirected from button aid)
Also found in: Dictionary, Thesaurus, Medical, Legal.
1. Mountaineering any of various devices such as piton or nut when used as a direct help in the ascent
2. (in medieval Europe; in England after 1066) a feudal payment made to the king or any lord by his vassals, usually on certain occasions such as the marriage of a daughter or the knighting of an eldest son