IPA: /ˌnɛsəˈsɛrɪli/
KK: /nɛsəˈsɛrɪli/
In a way that cannot be avoided or is required; inevitably.
You don't necessarily have to attend the meeting if you have other commitments.
Necessarily → It is formed from "necessarius" (meaning necessary) and the suffix "-ly" (meaning in a manner of). The word "necessarily" means in a manner that is required or essential.
Think of something that is 'required' ('necessarius') and how it is done 'in a manner' ('-ly'). This helps you remember that 'necessarily' means something must be done in a required way.