Meaning

noun great merriment

originFrom Middle English merth, myrthe, murhthe, from Old English myrġþ (“mirth, joy”), from Proto-West Germanic *murgiþu (“briefness, brevity”); equivalent to merry + -th (abstract nominal suffix). Cognate with Middle Dutch merchte (“pleasure, joy, delight”).

Etymology from Wiktionary, CC BY-SA 3.0