An archaic word meaning 'thank you' or 'much gratitude,' often used in old-fashioned or theatrical speech.
From Old French 'grant merci' (great thanks), literally 'great' + 'mercy.' It was common in Middle English but fell out of everyday use by the 1700s.
You'll see 'gramercy' in Shakespeare plays where characters say it to show politeness, but it completely disappeared from normal English by the Victorian era—it's one of those words that shows how 'thanks' used to be way more formal and dramatic.
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