| A | B |
| mechanics | the branch of physics that treats the phenomena caused by the action of forces |
| medallion | a large medal |
| meddlesome | interfering |
| medial | of or pertaining to the middle |
| mediate | to effect by negotiating as an agent between parties |
| medicine | a substance possessing or reputed to possess curative or remedial properties |
| medieval | belonging or relating to or descriptive of the middle ages |
| mediocre | Ordinary |
| meditation | The turning or revolving of a subject in the mind. |
| medley | A composition of different songs or parts of songs arranged to run as a continuous whole |
| meliorate | To make better or improve, as in quality or social or physical condition |
| mellifluous | Sweetly or smoothly flowing |
| melodious | Characterized by a sweet succession of sounds |
| melodrama | A drama with a romantic story or plot and sensational situation and incidents |
| memento | A souvenir. |
| memorable | Noteworthy. |
| menace | A threat |
| menagerie | A collection of wild animals, especially when kept for exhibition |
| mendacious | Untrue. |
| mendicant | A beggar |
| mentality | Intellectuality. |
| mentor | A wise and faithful teacher, guide, and friend. |
| mercantile | Conducted or acting on business principles; commercial. |
| mercenary | Greedy |
| merciful | Disposed to pity and forgive. |
| merciless | Cruel. |
| meretricious | Alluring by false or gaudy show. |
| mesmerize | To hypnotize. |
| messieurs | Gentlemen. |
| metal | An element that forms a base by combining with oxygen, is usually hard, heavy, and lustrous. |
| metallurgy | The art or science of extracting a metal from ores, as by smelting. |
| metamorphosis | A passing from one form or shape into another. |
| metaphor | . A figure of speech in which one object is likened to another, by speaking as if the other. |
| metaphysical | Philosophical. |
| metaphysician | One skilled in metaphysics. |
| metaphysics | The principles of philosophy as applied to explain the methods of any particular science. |
| mete | To apportion |
| metempsychosis | Transition of the soul of a human being at death into another body, whether human or beast. |
| meticulous | Over-cautious |
| metonymy | A figure of speech that consists in the naming of a thing by one of its attributes. |
| metric | Relating to measurement |
| metronome | An instrument for indicating and marking exact time in music. |
| metropolis | A chief city, either the capital or the largest or most important city of a state. |
| metropolitan | Pertaining to a chief city |
| mettle | Courage. |
| mettlesome | Having courage or spirit |
| microcosm | The world or universe on a small scale |
| micrometer | . An instrument for measuring very small angles or dimensions. |
| microphone | An apparatus for magnifying faint sounds |
| microscope | An instrument for assisting the eye in the vision of minute objects or features of objects. |
| microscopic | Adapted to or characterized by minute observation |
| microscopy | The art of examing objects with the microscope |
| midsummer | The middle of the summer |