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Phrases. 1  be of assistance. 2  Be of practical use or help. âthe guide will be of assistance to development groupsâ. ââWe hope this small fund and material aid will be of assistance to the victims,â a press release stated.â.
Full Definition of AID. transitive verb. : to provide with what is useful or necessary in achieving an end. intransitive verb. : to give assistance. â aidÂ·er noun. See aid defined for English-language learners. See aid defined for kids.