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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.
serving to help or assist; auxiliary. 2. Medicine/Medical. utilizing drugs, radiation therapy, or other means of supplemental treatment following cancer surgery. noun. 3. a person or thing that aids or helps. 4. anything that aids in removing or preventing a disease, especially a substance added to a prescription to aid the effect of the main ingredient.