Essential; crucial; extremely important. / (grammar) Of, or relating to the imperative mood. / (computing theory) Having semantics that incorporates mutable variables.

(uncountable, grammar) 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.

An emperor.

In an imperative manner.

plural of imperative

(obsolete) Done by express direction; not involuntary; commanded.

The state or condition of being imperative.

commanding

plural of imperator

(grammar) Abbreviation of imperative.