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WordNet (r) 3.0 (2006) (WordNet)

active
adj 1: tending to become more severe or wider in scope; "active
tuberculosis" [ant: {inactive}]
2: engaged in or ready for military or naval operations; "on
active duty"; "the platoon is combat-ready"; "review the
fighting forces" [synonym: {active}, {combat-ready},
{fighting(a)}]
3: 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}]
4: taking part in an activity; "an active member of the club";
"he was politically active"; "the participating
organizations" [synonym: {active}, {participating}]
5: characterized by energetic activity; "an active toddler";
"active as a gazelle"; "an active man is a man of action"
[ant: {inactive}]
6: exerting influence or producing a change or effect; "an
active ingredient" [ant: {inactive}]
7: full of activity or engaged in continuous activity; "an
active seaport"; "an active bond market"; "an active account"
[ant: {inactive}]
8: in operation; "keep hope alive"; "the tradition was still
alive"; "an active tradition" [synonym: {active}, {alive(p)}]
9: (of the sun) characterized by an increased occurrence of
sunspots and flares and radio emissions [ant: {quiet}]
10: expressing that the subject of the sentence has the semantic
function of actor: "Hemingway favors active constructions"
[ant: {passive}]
11: (used of verbs (e.g. `to run') and participial adjectives
(e.g. `running' in `running water')) expressing action
rather than a state of being [synonym: {active}, {dynamic}]
[ant: {stative}]
12: (of e.g. volcanos) capable of erupting [ant: {extinct}]
13: (of e.g. volcanos) erupting or liable to erupt; "active
volcanos" [ant: {dormant}, {inactive}]
14: engaged in full-time work; "active duty"; "though past
retirement age he is still active in his profession" [ant:
{inactive}]
n 1: chemical agent capable of activity [synonym: {active agent},
{active}]
2: 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" [synonym: {active voice}, {active}] [ant:
{passive}, {passive voice}]
3: a person who is a participating member of an organization;
"the club issues a list of members, both the actives and the
retirees"