IPA: /ɪnˈdɪr.mənt/
KK: /ɪnˈdɪr mənt/
A word or action that shows love or affection towards someone.
She called him by a sweet endearment that made him smile.
Endearment → It is formed from "endear" (from the Old English *endearian*, meaning to make dear or beloved) and "-ment" (a suffix used to form nouns indicating an action or resulting state). The word "endearment" refers to the act or state of making someone dear or beloved.
Think of the action of making someone 'dear' — that's what 'endearment' means, a way to express affection.