Help; assistance; succor, relief.

"He came to my aid when I was foundering."

A helper; an assistant.

Something which helps; a material source of help.

"Slimming aids include dietary supplements and appetite suppressants."

An historical subsidy granted to the crown by Parliament for an extraordinary purpose, such as a war effort.

An exchequer loan.

A pecuniary tribute paid by a vassal to his feudal lord on special occasions.

An aide-de-camp, so called by abbreviation.

"The incompetent general's brilliant aid often made priceless suggestions."

To provide support to; to further the progress of; to help; to assist.

To climb with the use of aids such as pitons.