“imperative”

To do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a failure or negative consequence.

To allow to, not to prevent (+ infinitive, but usually without to).

To be vigilant and aware often as an imperative to alert a person to danger.

To reveal a non-obvious or hidden aspect of a plan or situation to (a person).