adjective / noun
active
AK-tiv/ˈæktɪv/
Doing or producing action rather than remaining passive.
The active young man runs along the park path with energetic strides.

Etymology
Built on “a doing,” active describes participation rather than passivity. Its early contrast with a contemplative life broadened to being lively, working, or in operation.
In context
villagers were active participants in their local politics even though they were forced to use indirect methods.
More examples
- The club has more than fifty active members.
- In the active voice, the subject performs the verb's action.
- Rewrite that passive sentence in the active.