Meanings
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1
adv
archaic: during the night immediately before today; last night
The messenger arrived yesternight and departed before dawn.
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2
noun
archaic: the night immediately before the present day
The terrors of yesternight seemed less real in the morning sun.
Thesaurus
Etymology
From Middle English yesternight and Old English gystran niht, a phrase combining giestran, 'yesterday,' + niht, 'night.' English later treated the phrase as a single adverb and noun. It survives chiefly in archaic, poetic, and historical writing.