IPA: /ˌɪntrəˈɡæləktɪk/
KK: /ɪntrəˈɡæləktɪk/
Happening or located inside a single galaxy.
The scientists studied intragalactic phenomena to understand the galaxy's formation.
Intragalactic is formed from "intra-" (meaning within) and "galactic" (from Greek "galaxias", meaning of the galaxy). The word refers to something that exists or occurs within a galaxy.
Think of 'intra-' meaning 'within' and 'galactic' relating to the galaxy — so intragalactic means something that happens within the galaxy.