IPA: /ˌɪntəˈɡæləktɪk/
KK: /ˌɪntərˈɡæləktɪk/
Relating to the space or events that happen between different galaxies.
The scientists are studying intergalactic travel to explore distant galaxies.
Intergalactic → It is formed from "inter-" (meaning between) and "galactic" (from Greek "galaxias", meaning milky or related to the Milky Way). The word describes something that exists or occurs between galaxies.
Think of 'between' ('inter-') and 'related to the Milky Way' ('galactic') to remember that 'intergalactic' refers to the space between galaxies.