'active' definitions:

Definition of 'active'

From: WordNet
adjective
Tending to become more severe or wider in scope; "active tuberculosis" [ant: inactive]
adjective
Engaged in or ready for military or naval operations; "on active duty"; "the platoon is combat-ready"; "review the fighting forces" [syn: active, combat-ready, fighting(a)]
adjective
Disposed to take action or effectuate change; "a director who takes an active interest in corporate operations"; "an active antagonism"; "he was active in drawing attention to their grievances" [ant: inactive, passive]
adjective
Taking part in an activity; "an active member of the club"; "he was politically active"; "the participating organizations" [syn: active, participating]
adjective
Characterized by energetic activity; "an active toddler"; "active as a gazelle"; "an active man is a man of action" [ant: inactive]
adjective
Exerting influence or producing a change or effect; "an active ingredient" [ant: inactive]
adjective
Full of activity or engaged in continuous activity; "an active seaport"; "an active bond market"; "an active account" [ant: inactive]
adjective
In operation; "keep hope alive"; "the tradition was still alive"; "an active tradition" [syn: active, alive(p)]
adjective
(of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions [ant: quiet]
adjective
Expressing that the subject of the sentence has the semantic function of actor: "Hemingway favors active constructions" [ant: passive]
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 [syn: active, dynamic] [ant: stative]
adjective
(of e.g. volcanos) capable of erupting [ant: extinct]
adjective
(of e.g. volcanos) erupting or liable to erupt; "active volcanos" [ant: dormant, inactive]
adjective
Engaged in full-time work; "active duty"; "though past retirement age he is still active in his profession" [ant: inactive]
noun
Chemical agent capable of activity [syn: active agent, active]
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" [syn: active voice, active] [ant: passive, passive voice]
noun
A person who is a participating member of an organization; "the club issues a list of members, both the actives and the retirees"

Synonyms of 'active'

From: Moby Thesaurus