IPA: /əˈkʌmpənɪmənt/
KK: /əˈkʌmpənɪmənt/
A noun that refers to a part of music that supports or goes along with a main melody, or something that adds to or enhances another thing.
The pianist played a beautiful accompaniment to the singer's performance.
Accompaniment is formed from "ac-" (meaning to) and "companiment" (from Latin "companio", meaning companion or one who eats bread with another). The word refers to something that goes along with or complements another, particularly in music or dining contexts.
Think of 'going along with' ('ac-') a 'companion' ('companio') — that's why accompaniment means something that complements or supports another.