Meaning of “active” - Learner’s Dictionary

active

adjective uk us /ˈæktɪv/
INVOLVED

B2 very involved in an organization or planned activity:

an active member of the church
He played an active role in the campaign.
BUSY

B1 doing a lot of things, or moving around a lot:

Even at the age of 80 she's still very active.
GRAMMAR

B1 An active verb or sentence is one in which the subject of the verb is the person or thing doing the action. For example 'Andy drove the car.' is an active sentence.

→ Compare passive adjective
VOLCANO

An active volcano could throw out rocks, fire, etc at any time.

(Definition of “active” from the Cambridge Learner’s Dictionary © Cambridge University Press)