English ascertain

← Middle English acerteynen (inherited)

← Spanish acertar (cognate)

← Old French acertener (derived)

← Old French a- (mention)

← Old French certener (mention)

← Old French certain (mention)

← Proto-Indo-European *krey- (root)

← Latin certus (derived)

→ English ascertainable (suffix)

→ English ascertainment (suffix)

→ English ascertainer (suffix)

→ English ascertaineth (suffix)

→ English ascertainest (suffix)

→ English reascertain (prefix)

→ English preascertain (prefix)

→ Spanish acertar (cognate)

→ Portuguese acertar (cognate)