| Noun | 1. | Se - a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable gray metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite) Synonyms: atomic number 34, selenium |
| 2. | SE - the compass point midway between south and east; at 135 degrees |
| 1. | (software) | SE - software engineering. | |
| 2. | SE - IBM Systems Engineer. | ||
| 3. | (networking) | se - The country code for Sweden. |