| A | B |
| 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 |
| 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 |
| monotony | A lack of variety |
| monsieur | A French title of respect, equivalent to Mr. and sir |
| monstrosity | Anything unnaturally huge or distorted |
| moonbeam | A ray of moonlight |
| morale | A state of mind with reference to confidence, courage, zeal, and the like. |
| moralist | A writer on ethics |
| morality | Virtue |
| moralize | To render virtuous |
| moratorium | An emergency legislation authorizing a government suspend some action temporarily. |
| morbid | Caused by or denoting a diseased or unsound condition of body or mind. |
| mordacious | Biting or giving to biting |
| mordant | Biting |
| moribund | On the point of dying |
| morose | Gloomy |
| morphology | the science of organic forms |
| motley | Composed of heterogeneous or inharmonious elements. |