different between posthaste vs immediately

English

Alternative forms

• post-haste, post haste

Etymology

From the former instruction on letters ‘haste, post, haste’, later reinterpreted as a compound of post +? haste.

Pronunciation

• (Received Pronunciation) IPA^(key): /?p??st?he?st/
• (US) IPA^(key): /?po?st?he?st/

Adverb

posthaste (not comparable)

1. quickly, as fast as someone travelling post; with great speed

   It is imperative that you finish your task posthaste.

   • 1946 — Paramahansa Yogananda, Autobiography of a Yogi, Ch. 17

     "Sasi cannot last through the night." These words from his physician, and the spectacle of my friend, now reduced almost to a skeleton, sent me posthaste to Serampore.

Synonyms

• (quickly): ASAP, quickly
• See also Thesaurus:quickly

Noun

posthaste (uncountable)

1. Alternative spelling of post-haste
   • 1602 : Hamlet by William Shakespeare, act 1 scene 1 l 103-106

     "And this, I take it,

     Is the main motive of our preparations

     The source of this our watch, and the chief head

     Of this post-haste and rummage in the land."

English

Etymology

From immediate +? -ly.

Pronunciation

• IPA^(key): /??mi?di.?tli/, /??mi?di.?tli/
• (colloquial) IPA^(key): /??mi?d??tli/, /??mi?d??tli/
• Hyphenation: im?me?di?ate?ly, im?me?diate?ly

Adverb

immediately (not comparable)

1. In an immediate manner; instantly or without delay.
   • For more quotations using this term, see Citations:immediately.

Synonyms

• forthwith, now, tout de suite; see also Thesaurus:immediately

Translations

Conjunction

immediately

1. directly (as soon as), instantly. Indicates that the independent clause describes something that occurs immediately after the dependent clause's referent does.

Synonyms

• as soon as
• directly after, immediately after, right after, etc.