ALLY

I. verb (allied; ~ing) see: ligature Date: 14th century transitive verb to unite or form a connection or relation between ; associate , intransitive verb to form or enter into an alliance , II. noun (plural allies) Date: 1598 a sovereign or state associated with another by treaty or league, a plant or animal linked to another by genetic or taxonomic proximity, one that is associated with another as a helper ; auxiliary