Active

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

a person who is a participating member of an organization

tending to become more severe or wider in scope

engaged in or ready for military or naval operations

disposed to take action or effectuate change

taking part in an activity

characterized by energetic activity

exerting influence or producing a change or effect

full of activity or engaged in continuous activity

in operation

(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: Hemingway favors active constructions

(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. volcanos) capable of erupting

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

engaged in full-time work