adjective
1.
/ ˈælaɪd; NAmE / (often Allied ) [ only before noun ] connected with countries that unite to fight a war together, especially the countries that fought together against Germany in the First and Second World Wars :
Italy joined the war on the Allied side in 1915.
allied forces / troops
2.
/ əˈlaɪd; ˈælaɪd/ allied (to / with sth) ( formal ) (of two or more things) similar or existing together; connected with sth :
medicine, nursing, physiotherapy and other allied professions
In this job you will need social skills allied with technical knowledge.
—see also ally
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WORD ORIGIN
Middle English : past participle of ally .