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im·per·a·tive ( m-p r -t v)
adj.
1. Expressing a command or plea; peremptory: requests that grew more and more imperative.
2. Having the power or authority to command or control.
3. Grammar Of, relating to, or constituting the mood that expresses a command or request.
4. Impossible to deter or evade; pressing: imperative needs. See Synonyms at urgent.
n.
1.
a. A command; an order.
b. An obligation; a duty: social imperatives.
2. A rule, principle, or instinct that compels a certain behavior: a people driven to aggression by territorial imperatives.