adjective
[more ~; most ~] formal :very important
grammar :having the form that expresses a command rather than a statement or a question
formal :expressing a command in a forceful and confident way
noun
plural -tives
[count] formal :a command, rule, duty, etc., that is very important or necessary
grammar
a the imperative :the form that a verb or sentence has when it is expressing a command
[count] :an imperative verb or sentence