IPA: /ˈɪntəˌliːɡ/
KK: /ˈɪntərˌliɡ/
Relating to or occurring between different leagues, especially in sports like baseball.
The interleague games this season have brought exciting matchups between teams from different leagues.
Interleague → It is formed from "inter-" (meaning between) and "league" (from Old French *ligue*, meaning a union or alliance). The word describes a competition or arrangement that occurs between different leagues or groups.
Think of things happening 'between' ('inter-') different 'alliances' ('league') — that's what interleague means.