(1):
(v. t.) The person or thing that promotes or helps in something done; a helper; an assistant.
(2):
(v. t.) A subsidy granted to the king by Parliament; also, an exchequer loan.
(3):
(v. t.) A pecuniary tribute paid by a vassal to his lord on special occasions.
(4):
(v. t.) An aid-de-camp, so called by abbreviation; as, a general's aid.
(5):
(v. t.) Help; succor; assistance; relief.
(6):
(v. t.) To support, either by furnishing strength or means in cooperation to effect a purpose, or to prevent or to remove evil; to help; to assist.