| 1. | imperturbable self-possession, poise, or assurance. |
| 2. | the perpendicular, or vertical, position. |

a·plomb (ə-plŏm', ə-plŭm') n. Self-confident assurance; poise. See Synonyms at confidence. [French, from Old French a plomb, perpendicularly : a, according to (from Latin ad-; see ad-) + plomb, lead weight (from Latin plumbum, lead).] |
| Main Entry: | aplomb1 |
| Part of Speech: | n |
| Definition: | great self-confidence; self-assuredness |
| Etymology: | Middle French a plomb 'according to the plummet' |
| Main Entry: | aplomb2 |
| Part of Speech: | n |
| Definition: | perpendicularity |
| Etymology: | Middle French a plomb 'according to the plummet' |