Webster's Revised Unabridged Dictionary · 1913

Mirth

Mirth , noun

[Old English mirthe, murthe, merthe, Anglo-Saxon myre, myrge, merhe, mirhe. See Merry.]

1.
Merriment; gayety accompanied with laughter; jollity.
Then will I cause to cease... from the streets of Jerusalem, the voice of mirth. — Jer. vii. 34
2.
That which causes merriment. [Obsolete] — Shakespeare