| A | B |
| megalith | large prehistoric stone structure |
| megalopolis | large group of large cities |
| megabyte | measurement of large amount of computer data |
| magnitude | large in extent, greatness |
| magnanimous | super generous |
| magnate | enormously successful businessperson |
| microbe | microscopic living organism |
| microclimate | climate of a small geographical area |
| microscopic | extremely small |
| equinox | one of two yearly crossings of sun |
| equitable | fair; even |
| equator | imaginary line dividing the earth in half |
| multitude | huge amount |
| multifaceted | having many sides or talents |
| multidisciplinary | many subjects |
| monogram | design made up of the initials of a name |
| monarchy | a government ruled by one person or family |
| monopoly | single business that controls the supply of something |
| quadruped | animal that walks on four feet |
| quadruple | multiply by four |
| quadriceps | four-part muscle in thigh |
| digraph | two letters that make one sound |
| diverge | to separate into two directions |
| dichotomy | division into two opposite positions or opinions |
| unison | in one voice |
| unilateral | made by a single-party or one side |
| uniform | same outfit or look for everyone in a group |
| trilogy | series of three books |
| tripod | stand or stool with three legs |
| triathlete | athlete competing in three sports |