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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.
Definition of aid. 1  transitive verb. : 2  to provide with what is useful or necessary in achieving an end aid a cause aid a friend. 3  intransitive verb. :  to give assistance research that aided in the discovery a new drug.