Entry 1 sense Webster, 1913 Aga /(ȧ*gä" [or] ā"gȧ)/ · A·ga · IPA /ˈɑː.ɡə/ 01 n. In Turkey, a commander or chief officer. It is used also as a title of respect. 1. In Turkey, a commander or chief officer. It is used also as a title of respect.