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The meaning of AID is to provide with what is useful or necessary in achieving an end. How to use aid in a sentence.

Aid is often used to refer to help given in the form of food, money, medical supplies, etc., to a country or group of people that is in need or because of an emergency:

Although the nouns aid and aide both have among their meanings “an assisting person,” the spelling aide is increasingly used for the sense “helper, assistant”: One of the senator's aides …

Aid is what you do when you help someone — you come to their aid. Rich countries provide economic aid to poor countries, and if you cut your hand, you'll be looking in the first aid kit for …

Aid is money, equipment, or services that are provided for people, countries, or organizations who need them but cannot provide them for themselves.

The informal British expression What's (all) this/that in aid of? is used to ask about the purpose of something. “ What's all this rushing about in aid of, then?” [=what's all this rushing about for?] …