Definition from Wiktionary, the free dictionary
Etymology 1 
aid (plural aids)
- Help; assistance; succor, relief.
- He came to my aid when I was foundering.
- An unconstitutional mode of obtaining aid. - Hallam
- The person who promotes or helps in something being done; a helper; an assistant.
- It is not good that man should be alone; let us make unto him an aid like unto himself. - Tobit viii. 6
- Something which helps; a material source of help.
- The incompetent general's brilliant aid often made priceless suggestions.
- (UK) A historical subsidy granted to the crown by Parliament for an extraordinary purpose, such as a war effort
- (UK) An exchequer loan.
- (law) A pecuniary tribute paid by a vassal to his feudal lord on special occasions.
- An aide-de-camp, so called by abbreviation
Derived terms 
help; succor; assistance; relief
a person that promotes or helps in something being done; a helper
something which helps; a material source of help
aide-de-camp — see aide-de-camp
Etymology 2 
- (transitive) To (give) support (to); to further the progress of; to help; to assist.
- You speedy helpers […] Appear and aid me in this enterprise.
- 2012 May 24, Nathan Rabin, “Film: Reviews: Men In Black 3”, The Onion AV Club:
- Smith is aided in his quest by an elfin, time-jumping alien with psychic powers played by another Coen brothers veteran, A Serious Man star Michael Stuhlbarg.
Derived terms 
Related terms