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.

In an imperative manner.

plural of imperative

The state or condition of being imperative.

An emperor.

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

(colloquial, archaic) impertinence

plural of imperence

commanding