[uncountable] money, food, etc. that is sent to help countries in difficult situations. humanitarian/food/medical aid; An extra £10 million in foreign aid ...

aid · ​. to help somebody/something to do something, especially by making it easier synonym assist. aid in something The test is designed to aid in the diagnosis ...

aid · 1[uncountable] money, food, etc. · 2[uncountable] help that you need to perform a particular task He was breathing only with the aid of a ventilator. · 3[ ...

to help someone or something to do something, especially by making it easier. synonym assist aid in something/in doing something.

A means or source of help or assistance; anything used to assist in performing a task, esp. (in later use) a tool, device, or other object used in this way.

There is one meaning in OED's entry for the noun AID. See 'Meaning & use' for definition, usage, and quotation evidence. This word is used in U.S. English. See ...

​an organization that helps people or countries in difficult situations by providing food, medicine, etc. They work for an international aid agency ...

simple medical treatment that is given to somebody before a doctor comes or before the person can be taken to a hospital

[uncountable] ​money, food or equipment provided by the US federal (= central) government. Large amounts of federal aid have been directed to the areas worst ...

the abbreviation for'Acquired Immune Deficiency Syndrome'(a very serious illness that attacks the body's ability to resist infection)