Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of posthaste is as below...

Posthaste :: Posthaste (adv.) With speed or expedition; as, he traveled posthaste; to send posthaste..

Posthaste :: Posthaste (n.) Haste or speed in traveling, like that of a post or courier..

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