ETYM French actif, Latin activus, from agere to act.
1. Characterized by energetic activity.
2. Characterized by energetic bodily activity; SYN. physical.
3. (Grammar) Expressing action rather than a state of being; used of verbs (e.g. 'to run') and participial adjectives (e.g. 'running' in 'running water'); SYN. dynamic.
4. (Military) Engaged in or ready for military or naval operations; SYN. combat-ready, fighting.
5. (Of e.g. volcanos) Being in a state of action or potential action.
6. (Pathology) Tending to become more severe or wider in scope.
7. Being in physical motion; SYN. on the move.
8. (Astronomy; of the sun) Characterized by a high level activity in sunspots and flares and radio emissions.
9. Disposed to take action or effectuate change.
10. Exerting influence or producing an effect.
11. Engaged in full-time work; (military).
12. In operation.
13. Taking part in an activity; SYN. participating.

Pertaining to the device, program, file, or portion of the screen that is currently operational or subject to command operations. Usually the cursor or a highlighted section shows the active element on the display screen.

1. Chemical agent capable of activity
2. The voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb
3. A person who is a participating member of an organization