Entry 1 sense Webster, 1913 Mummer /mŭm'-ẽr/ · Mumm·er · IPA /ˈmʌm.ɚ/ 01 n. One who mumms, or makes diversion in disguise; a masker; a buffon. 1. One who mumms, or makes diversion in disguise; a masker; a buffon. “Jugglers and dancers, antics, mummers.” — Milton.