aidaidaidsaidedaidingnoun (no plural)1help, or something that gives help: He walks with the aid of a stick.She wears a hearing aid (= a small thing that you put in your ear so you can hear better).2money, food, etc. that is sent to a country or to people in order to help them: We sent aid to the earthquake victims.in aid of somebody or somethingfor somebody or something, especially for a charity: a concert in aid of Children in Need