peradventure

Main Entry: ¹per·ad·ven·ture 

Pronunciation: \ˈpər-əd-ˌven-chər, ˈper-; ˌpər-əd-ˈ, ˌper-\

Function: adverb

Etymology: Middle English par aventure, from Anglo-French, by chance

Date: 14th century

archaic : perhaps, possibly