imperative(noun) some duty that is essential and urgent
(noun) a mood that expresses an intention to influence the listener's behavior
(adjective) requiring attention or action; "as nuclear weapons proliferate, preventing war becomes imperative"; "requests that grew more and more imperative"
(adjective) relating to verbs in the imperative mood
Source:
WordNet 2.0 Copyright 2003 by Princeton University. All rights reserved.
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