| Term | Definition |
| misogamy | Hatred of marriage. |
| misogyny | Hatred of women. |
| misplace | To put into a wrong place. |
| misrepresent | To give a wrong impression. |
| misrule | To misgovern. |
| missal | The book containing the service for the celebration of mass. |
| missile | Any object, especially a weapon, thrown or intended to be thrown. |
| missive | A message in writing. |
| mistrust | To regard with suspicion or jealousy. |
| misty | Lacking clearness |
| misunderstand | To Take in a wrong sense. |
| misuse | To maltreat. |
| mite | A very small amount, portion, or particle. |
| miter | The junction of two bodies at an equally divided angle. |
| mitigate | To make milder or more endurable. |
| mnemonics | A system of principles and formulas designed to assist the recollection in certain instances. |
| moat | A ditch on the outside of a fortress wall. |
| mobocracy | Lawless control of public affairs by the mob or populace. |
| moccasin | A foot-covering made of soft leather or buckskin. |
| mockery | Ridicule. |
| moderation | Temperance. |
| moderator | The presiding officer of a meeting. |
| modernity | The state or character of being modern. |
| modernize | To make characteristic of the present or of recent times. |
| modification | A change. |
| modify | To make somewhat different. |
| modish | Fashionable. |
| modulate | To vary in tone, inflection, pitch or other quality of sound. |
| mollify | To soothe. |
| molt | To cast off, as hair, feathers, etc. |
| momentary | Lasting but a short time. |
| momentous | Very significant. |
| momentum | An impetus. |
| monarchy | Government by a single, sovereign ruler. |
| monastery | A dwelling-place occupied in common by persons under religious vows of seclusion. |
| monetary | Financial. |
| mongrel | The progeny resulting from the crossing of different breeds or varieties. |
| monition | Friendly counsel given by way of warning and implying caution or reproof. |
| monitory | Admonition or warning. |
| monocracy | Government by a single person. |
| monogamy | The habit of pairing, or having but one mate. |
| monogram | A character consisting of two or more letters interwoven into one, usually initials of a name. |
| monograph | A treatise discussing a single subject or branch of a subject. |
| monolith | Any structure or sculpture in stone formed of a single piece. |
| monologue | A story or drama told or performed by one person. |
| monomania | The unreasonable pursuit of one idea. |
| monopoly | The control of a thing, as a commodity, to enable a person to raise its price. |
| monosyllable | A word of one syllable. |
| monotone | The sameness or monotony of utterance. |
| monotonous | Unchanging and tedious. |