| Term | Definition |
| mausoleum | N. monumental tomb |
| mauve | ADJ. pale purple |
| maverick | *N. rebel; nonconformist |
| mawkish | ADJ. mushy and gushy; icky-sticky sentimental; maudlin |
| maxim | N. poverb; a truth pithily stated |
| mayhem | N. injury to body |
| meager | ADJ. scanty; iadequate |
| mealymouthed | ADJ. indirect in speech; hypocritical; evasive |
| meander | V. wind or turn in its course |
| meddlesome | ADJ. interfering |
| mediate | V. settle a disput through the services of an outsider |
| mediocre | ADJ. ordinary; commonplace |
| meditation | N. reflection; thought |
| medium | N. element that is a creature's natural environment; nutrient setting in which microorganisms are cultivated N. appropriate occupation or means of expression; channel of communication; compromise |
| medley | N. mixture |
| meek | ADJ. submissive; patient and long-suffering |
| megalomania | N. mania for doing grandiose things |
| melancholy | ADJ. gloomy; morose; blue |
| melee | N. fight |
| mellifluous | ADJ. sweetly or smoothly flowing; melodious |
| memento | N. token; reminder |
| memorialize | V. commemorate |
| menagerie | N. collection of wild animals |
| mendacious | *ADJ. lying; habitually dishonest |
| mendicant | N. beggar |
| menial | ADJ. suitable for servants; lowly; mean |
| mentor | counselor; teacher |
| mercantile | ADJ. concerning trade |
| mercenary | ADJ. motivated solely by money or gain |
| mercurial | ADJ. capricious; changing; fickle |
| meretricious | ADJ. flashy; tawdry |
| merger | N. combination (of two business corporations) |
| mesmerize | V. hypnotize |
| metallurgical | ADJ. pertaining to the art of removing metals from ores |
| metamorphosis | *N. change of form |
| metaphysical | ADJ. pertaining to speculative philosophy |
| mete | V. measure; distribute |
| meteoric | ADJ. swift; momentarily brilliant |
| methodical | ADJ. systematic |
| meticulous | *ADJ. excessively careful; painstaking; scrupulous |
| mettle | N. courage; spirit |
| miasma | N. swamp gas; heavy, vaporous atmosphere, often emanating from decaying matter; pervasive corrupting influence |
| microcosm | N. small world; the world in miniature |
| milieu | N. environment; means of expression |
| militate | V. work against |
| millennium | N. thousand-year period; period of happiness and prosperity |
| mimicry | N. imitation |
| minatory | ADJ. menacing; threatening |
| mincing | ADJ. affectedly dainty |
| minion | N. a servile dependent |
| minutiae | N. petty details |
| mirage | N. unreal reflection; optical illusion |
| mire | V. entangle; stick in swampy ground |
| mirth | N. merriment; laughter |
| misadventure | N. mischance; ill luck |
| misanthrope | *N. one who hates mankind |
| misapprehension | N. error; misunderstanding |
| miscellany | N. mixture of writings on various subjects |
| mischance | N. ill luck |
| misconstrue | V. interpret incorrectly; misjudge |
| miscreant | N. wretch; villain |
| misdemeanor | N. minor crime |
| misgivings | N. doubts |
| mishap | N. accident |
| misnomer | N. wrong name; incorrect designation |