(transitive) To provide support to; to further the progress of; to help; to assist. / (climbing) To climb with the use of aids such as pitons.

(uncountable) Help; assistance; succor, relief. / (countable) A helper; an assistant. / (countable) Something which helps; a material source of help.

(UK, informal) for the sake of, for (usually placed at the end of a question when quizzing a person about why they have done something)

Initialism of Agency for International Development.

(slang, vulgar) Extremely annoying or frustrating.

(medicine, acronym) Acquired immune deficiency syndrome.

present participle of aid

The act of one who aids or assists.

Alternative letter-case form of AIDS acquired immune deficiency syndrome

An assistant. / (military) An officer who acts as assistant to a more senior one; an aide-de-camp.