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Synonyms
bang, directly, forthwith, headlong, immediately, incontinently, instantaneously, instantly, now, PDQ, plumb, presently, promptly, pronto, right, right away, right now, right off, straight off, straightaway, straightway
1688, in the meaning defined above
Medieval Latin, from instant-, instans
More from Merriam-Webster on instanter
Rhyming Dictionary: Words that rhyme with instanter
Thesaurus: All synonyms and antonyms for instanter
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