"premeditated," a legal word, 1580s, from afore + past tense of think. Apparently an English loan-translation of the Old French legalese word prepense (see prepense) in the phrase malice prepense "malice aforethought" (Coke).
with malice aforethought
aflutter
afoot
afore
aforementioned
aforesaid
aforethought
aforetime
afoul
afraid
A-frame
afresh