Active (adjective)

1. Involved in or participating in an action, especially a process or event.
2. Full of energy and enthusiasm.
3. Having a part in producing a particular effect or result.

Origin:

The word 'active' originated from the latin word 'activus' which means 'effective' or 'full of energy'.

Examples:

1. She is an active member of the environmental group.
2. He is known for his active lifestyle and daily exercise routine.
3. The company is looking for an active investor to provide financial support.
4. She remains active in politics even in her old age.
5. The active ingredient in this medicine is aspirin.