What is the meaning of imperity?

Expressive of command; containing positive command; authoritatively or absolutely directive; commanding; authoritative; as, imperative orders., Not to be avoided or evaded; obligatory; binding; compulsory; as, an imperative duty or order., Expressive of commund, entreaty, advice, or exhortation; as, the imperative mood., The imperative mood; also, a verb in the imperative mood.