active

characterized by energetic activity“an active toddler”

full of activity or engaged in continuous activity“an active seaport”

disposed to take action or effectuate change“a director who takes an active interest in corporate operations”

engaged in or ready for military or naval operations“on active duty”

exerting influence or producing a change or effect“an active ingredient”

in operation“keep hope alive”

taking part in an activity“an active member of the club”

(of e.g. volcanoes) capable of erupting

tending to become more severe or wider in scope“active tuberculosis”

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

(of e.g. volcanoes) erupting or liable to erupt“active volcanoes”

engaged in full-time work“active duty”

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

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

chemical agent capable of activity

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”

a person who is a participating member of an organization“the club issues a list of members, both the actives and the retirees”