What is the meaning of Imperative?

Essential; crucial; extremely important.

Of, or relating to the imperative mood.

Having semantics that incorporates mutable variables.

Expressing a command; authoritatively or absolutely directive.

The grammatical mood expressing an order (see jussive). In English, the imperative form of a verb is the same as that of the bare infinitive.

A verb in the imperative mood.

An essential action, a must: something which is imperative.

feminine plural of imperativo

In an imperative manner, imperatively.

indefinite plural of imperativ

Source: wiktionary.org