C15: from Medieval Latin aequivocāre, from Late Latin aequivocus ambiguous, equivocal
Word Origin and History for equivocate
v.
early 15c., equivocaten, from Medieval Latin equivocatus, past participle of equivocare "to call by the same name," from Late Latin aequivocus (see equivocation). Related: Equivocated; equivocating.