Definition of "Active" :

noun: a person who is a participating member of an organization

"The club issues a list of members, both the actives and the retirees."

noun: the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb

"The boy threw the ball' uses the active voice."

noun: chemical agent capable of activity

adjective: characterized by energetic activity

"An active toddler."

adjective: engaged in full-time work

"Active duty."

adjective: full of activity or engaged in continuous activity

"An active seaport."

adjective: tending to become more severe or wider in scope

"Active tuberculosis."

adjective: disposed to take action or effectuate change

"A director who takes an active interest in corporate operations."

adjective: (of e.g. volcanos) erupting or liable to erupt

"Active volcanos."

adjective: (of e.g. volcanos) capable of erupting

adjective: (used of verbs (e.g. to run') and participial adjectives (e.g. running' in running water')) expressing action rather than a state of being

adjective: expressing that the subject of the sentence has the semantic function of actor:

"Hemingway favors active constructions."

adjective: exerting influence or producing a change or effect

"An active ingredient."

adjective: (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions

adjective: in operation

"An active tradition."

adjective: taking part in an activity

"An active member of the club."

adjective: engaged in or ready for military or naval operations

"On active duty."