Meaning

adverb at a previous time

originFrom Middle English erste, from Old English ǣresta (“first”), from Proto-West Germanic *airist (“earliest, first”), equivalent to ere + -est. Cognate with North Frisian iarst, iáárs, jarst, jest (“first”), West Frisian earst (“first”), Dutch eerste (“first”), German erste (“first”).

Etymology from Wiktionary, CC BY-SA 3.0