IPA: //əˈdʌltəri//
KK: /əˈdʌltəri/
This term refers to the act of a married person having sexual relations with someone who is not their spouse.
The scandal involved allegations of adultery that shocked the community.
Adultery → It is formed from "ad-" (meaning to) and "ulteri" (from Latin "ulterior", meaning beyond or further). The word originally referred to going beyond the bounds of marriage, thus describing the act of infidelity.
Think of 'going beyond' ('ad-' means to, and 'ulteri' means further) the commitment of marriage — that's why adultery refers to being unfaithful.