1) Acting as one 2) Aetna competitor 3) Affiliated 4) Banded together 5) Confederate 6) Confederated 7) Connected 8) Connected in a way 9) Federated 10) Fighting on the same side 11) Formed a 2D 12) Hand and glove 13) In a league 14) In cahoots 15) In it together 16) In league 17) In something together 1) Agnate 2) Aligned 3) Confederative 4) Connected 5) Inleague 6) Linked 7) Related 8) Sided 9) Teamed 10) United 
[automobile] The Allied automobile was a taxicab built in Elkhart, Indiana, by the Allied Cab Manufacturing Co. The company started production in 1932, using the factory of the Elcar automobile, which had ended production in 1931. Several former Elcar employees who had been involved with Elcar taxicab production joined the new company. Prod...
• (a.) United; joined; leagued; akin; related. See Ally. • (imp. & p. p.) of Ally
Al·lied' adjective United; joined; leagued; akin; related. See Ally . 
Of or relating to Britain and its allies in the First and Second World Wars and after. An ally in this sense is state formally cooperating with another for a military or other purpose.
[adj] - united in a confederacy or league 2. [adj] - related by common characteristics or ancestry 3. [adj] - joined by treaty or agreement
confederate adjective united in a confederacy or league
joined by treaty, agreement, or common cause: allied nations. · related; kindred: allied species. · (cap.) of or pertaining to the Allies.