| A | B |
| monarchy (n) | rule by a single person |
| monochromatic (adj) | of one color |
| monocle (n) | eyeglass for one eye |
| monogamy (n) | marriage with one mate at a time |
| monogram (n) | two or more letters interwoven to represent a name |
| monograph (n) | written account of a single thing or class of things |
| monolith (n) | single stone of large size; obelisk |
| monolithic (adj) | massive and rigidly uniform |
| monologue (n) | long speech by one person |
| monomania (n) | excessive concentration on one idea or subject |
| monomorphic (adj) | having a single form |
| monosyllabic (adj) | having one syllable |
| monotheism (n) | belief that there is one God |
| monotonous (adj) | continuing in an unchanging tone; wearying |