allied

/əˈlaɪd/
/əˈlaɪd/
/əˈlaɪd/

adjective

  1. Joined as allies.

  2. Related.

    "bacteriology and allied subjects"

verb

  1. To unite, or form a connection between, as between families by marriage, or between princes and states by treaty, league, or confederacy.

  2. To connect or form a relation between by similitude, resemblance, friendship, or love.

Synonyms: make common cause