from The American Heritage® Dictionary of the English Language, 4th Edition
- interj. Archaic Used to express surprise or gratitude.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- interj. Thanks; many thanks; an expression of gratitude.
- interj. Used as an exclamation expressing surprise or sudden strong feelings.
- n. Thanks.
from the GNU version of the Collaborative International Dictionary of English
- interj. A word formerly used to express thankfulness, with surprise; many thanks.
from The Century Dictionary and Cyclopedia
- Great thanks; many thanks: used interjectionally to express thankfulness, sometimes mingled with surprise.
Middle English gramerci, from Old French grand merci : grand, great; see grand + merci, thanks; see mercy.(American Heritage® Dictionary of the English Language, Fourth Edition)
Middle English gramerci, from Old French grant merci “great thanks.” (Wiktionary)