IPA: /nɒnɪˈsɛnʃəl/
KK: /nɑnɪˈsɛnʃəl/
Something that is not necessary or important.
The meeting included many nonessential topics that could have been discussed later.
Nonessential → It is formed from "non-" (meaning not) and "essential" (from Latin "essentia", meaning essence or being). The word "nonessential" means not essential or not absolutely necessary.
Think of 'not' ('non-') being added to 'essence' — this helps you remember that 'nonessential' refers to something that is not absolutely necessary.