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to provide support for or relief to; help:
to aid the homeless victims of the fire.
to promote the progress or accomplishment of; facilitate.
to give help or assistance.
help or support; assistance.
a person or thing that aids or furnishes assistance; helper; auxiliary.
aids, Manège.

Also called natural aids. the means by which a rider communicates with and controls a horse, as the hands, legs, voice, and shifts in weight.
Also called artificial aids. the devices by means of which a rider increases control of a horse, as spurs, whip, and martingale.

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a payment made by feudal vassals to their lord on special occasions.
English History. (after 1066) any of several revenues received by a king in the Middle Ages from his vassals and other subjects, limited by the Magna Charta to specified occasions.
Historical Examples

Guy, I have spoken to the rector about you—you will find him your friend and aider; and May is to make her home at the rectory.
Sir Noel’s Heir May Agnes Fleming

What would he not give, or say, or do, to find me his aider and abettor?
Lord Kilgobbin Charles Lever

Instantly to turn upon me, charging that I have no sense of the enormity of the crime itself, but am its aider and abettor!
The Mystery of Edwin Drood Charles Dickens

He is the friend and aider of those who would live in the spirit.
Discourses in America Matthew Arnold

Such an idea might occur to the aider, but not to the fugitive himself, to whom every moment must be of the highest importance.
Matilda Montgomerie Major (John) Richardson

Isn’t Alick McGregor a nice fellow to rob his own father and you his aider and abettor?
A Changed Heart May Agnes Fleming

Is it to forsake the slave when I cease to be the aider and abettor of his master?
William Lloyd Garrison Archibald H. Grimke

Beckoning Fate to do her worst, he then climbs an aider tree in a state of perfect nudity.
August Strindberg, the Spirit of Revolt L. (Lizzy) Lind-af-Hageby

For if I take this charge upon me for your sake, men will say I was your aider in this crime that they charge upon you.
King Arthur’s Knights Henry Gilbert

And when I’ve so wanted to sleep with some one sometime—some one that belonged to me, you know; not a Ladies’ aider.
Pollyanna Eleanor H. Porter

verb
to give support to (someone to do something); help or assist
(transitive) to assist financially
noun
assistance; help; support
a person, device, etc, that helps or assists: a teaching aid
(mountaineering) Also artificial aid. any of various devices such as piton or nut when used as a direct help in the ascent
(in medieval Europe; in England after 1066) a feudal payment made to the king or any lord by his vassals, usually on certain occasions such as the marriage of a daughter or the knighting of an eldest son
(Brit, informal) in aid of, in support of; for the purpose of
combining form
denoting a charitable organization or function that raises money for a cause: Band Aid, Ferryaid
abbreviation
acute infectious disease
artificial insemination (by) donor: former name for Donor Insemination (DI)
n.

early 15c., “wartime tax,” also “help, support, assistance,” from Old French aide, earlier aiudha “aid, help, assistance” (9c.), from Late Latin adjuta, from fem. past participle of Latin adiuvare (past participle adiutus) “to give help to,” from ad- “to” (see ad-) + iuvare “to help” (see adjutant). Meaning “thing by which assistance is given” is recorded from c.1600. Meaning “material help given by one country to another” is from 1940.
v.

c.1400, “to assist, help,” from Old French aidier “help, assistance,” from Latin adiutare, frequentative of adiuvare (past participle adiutus) “give help to” (see adjutant). Related: Aided; aiding.

AID abbr.
artificial insemination donor
Agency for International Development