Definition of allied adjective from the Oxford Advanced American Dictionary

Oxford3000

allied

adjective
 
1
/ˈælaɪd/
 
often Allied [only before noun] connected with countries that unite to fight a war together, especially the countries that fought together against Germany in World Wars I and IIItaly joined the war on the Allied side in 1915.Many civilians died as a result of allied bombing.allied forces/troops
2
/əˈlaɪd; ˈælaɪd/
 
(formal) (of two or more things) similar or existing together; connected with somethingmedicine, nursing, physiotherapy, and other allied professions allied to/with somethingThis job requires social skills allied with technical knowledge.
see also ally