Basic Guidelines For English Spellings
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1An appeal for applause at the end of a play, etc.
2Plaudit.
Mid 16th century; earliest use found in Thomas Drant (c1540–1578), poet and Church of England clergyman. From classical Latin plauditē applaud! 2nd plural imperative of plaudere plaud, the customary appeal for applause made by Roman actors at the end of a play.