| A | B |
| monos (G) | one |
| unus (L) | one |
| duo (L) | two |
| duplex (L) | twofold |
| bi (L) | two |
| monologue (n) | A long speech made by one performer or by one person in a group. |
| monarch (n) | 1. A person who rules a kingdom or empire;a king or queen, emperor or empress. |
| monarch (n) | 2. A large black and orange American butterfly. |
| monogram (n) | A design composed of lettes, usually the first letter of a name. |
| monopoly (n) | 1. Exclusive control of the trade in some item or service. |
| monopoly (n) | 2. Sole ownership or control of anything. |
| monolith (n) | 1. A large block of stone. |
| monolith (n) | 2. A large organization that acts as a single unit. |
| unanimous (adj.) | Being in complete agreement. |
| unilateral (adj.) | One-sided; done by or affecting one person, group, or country, etc., and not another. |
| duplex (n) | A dwelling with two units. |
| duplicate (tr. v.) | To make an identical copy or double of something; to repeat. |
| bilateral (adj.) | 1. Having two sides |
| bilateral (adj.) | 2. Made between two persons or groups. |
| bipartisan (adj.) | Involving two political parties. |