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Wordnet 3.0

NOUN (3)

1. chemical agent capable of activity;
[syn: 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;
- Example: "`The boy threw the ball' uses the active voice"
[syn: active voice, active]

3. a person who is a participating member of an organization;
- Example: "the club issues a list of members, both the actives and the retirees"


ADJECTIVE (14)

1. tending to become more severe or wider in scope;
- Example: "active tuberculosis"

2. engaged in or ready for military or naval operations;
- Example: "on active duty"
- Example: "the platoon is combat-ready"
- Example: "review the fighting forces"
[syn: active, combat-ready, fighting(a)]

3. disposed to take action or effectuate change;
- Example: "a director who takes an active interest in corporate operations"
- Example: "an active antagonism"
- Example: "he was active in drawing attention to their grievances"

4. taking part in an activity;
- Example: "an active member of the club"
- Example: "he was politically active"
- Example: "the participating organizations"
[syn: active, participating]

5. characterized by energetic activity;
- Example: "an active toddler"
- Example: "active as a gazelle"
- Example: "an active man is a man of action"

6. exerting influence or producing a change or effect;
- Example: "an active ingredient"

7. full of activity or engaged in continuous activity;
- Example: "an active seaport"
- Example: "an active bond market"
- Example: "an active account"

8. in operation;
- Example: "keep hope alive"
- Example: "the tradition was still alive"
- Example: "an active tradition"
[syn: active, alive(p)]

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

10. expressing that the subject of the sentence has the semantic function of actor: "Hemingway favors active constructions";

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;
[syn: active, dynamic]

12. (of e.g. volcanos) capable of erupting;

13. (of e.g. volcanos) erupting or liable to erupt;
- Example: "active volcanos"

14. engaged in full-time work;
- Example: "active duty"
- Example: "though past retirement age he is still active in his profession"


The Collaborative International Dictionary of English v.0.48:

Active \Ac"tive\, a. [F. actif, L. activus, fr. agere to act.] 1. Having the power or quality of acting; causing change; communicating action or motion; acting; -- opposed to passive, that receives; as, certain active principles; the powers of the mind. [1913 Webster] 2. Quick in physical movement; of an agile and vigorous body; nimble; as, an active child or animal. [1913 Webster] Active and nervous was his gait. --Wordsworth. [1913 Webster] 3. In action; actually proceeding; working; in force; -- opposed to quiescent, dormant, or extinct; as, active laws; active hostilities; an active volcano. [1913 Webster] 4. Given to action; constantly engaged in action; energetic; diligent; busy; -- opposed to dull, sluggish, indolent, or inert; as, an active man of business; active mind; active zeal. [1913 Webster] 5. Requiring or implying action or exertion; -- opposed to sedentary or to tranquil; as, active employment or service; active scenes. [1913 Webster] 6. Given to action rather than contemplation; practical; operative; -- opposed to speculative or theoretical; as, an active rather than a speculative statesman. [1913 Webster] 7. Brisk; lively; as, an active demand for corn. [1913 Webster] 8. Implying or producing rapid action; as, an active disease; an active remedy. [1913 Webster] 9. (Gram.) (a) Applied to a form of the verb; -- opposed to passive. See Active voice, under Voice. (b) Applied to verbs which assert that the subject acts upon or affects something else; transitive. (c) Applied to all verbs that express action as distinct from mere existence or state. [1913 Webster] Active capital, Active wealth, money, or property that may readily be converted into money. [1913 Webster] Syn: Agile; alert; brisk; vigorous; nimble; lively; quick; sprightly; prompt; energetic. [1913 Webster]
WordNet (r) 3.0 (2006):

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" [syn: 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" [syn: 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" [syn: 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 [syn: 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 [syn: 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" [syn: 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"
Moby Thesaurus II by Grady Ward, 1.0:

157 Moby Thesaurus words for "active": acting, active voice, activist, activistic, acute, aggressive, agile, alert, alive, animated, assiduous, at work, bouncing, bouncy, breezy, brisk, bubbly, bustling, busy, catty, chipper, compliant, conforming, conscientious, constant, devoted, devout, diligent, driving, duteous, dutiful, dynamic, ebullient, effective, effectual, effervescent, efficacious, efficient, energetic, enterprising, enthusiastic, expeditious, faithful, flexible, forceful, forcible, frisky, full, full of go, full of life, full of pep, functional, functioning, go-go, going, going on, graceful, hearty, hyperactive, impelling, impetuous, in exercise, in force, in hand, in motion, in operation, in play, in practice, in process, in the works, inaction, incisive, industrious, influential, intense, keen, kinetic, live, lively, living, loyal, lusty, medio-passive, mercurial, meticulous, mettlesome, middle, middle voice, militant, mindful, mobile, motile, motivational, motive, motor, moving, nimble, observant, occupied, on foot, on the fire, on the go, on the move, ongoing, operating, operational, operative, passive, passive voice, peppy, perky, pert, physical, potent, powerful, practicing, prompt, propellant, propelling, punctilious, punctual, quick, quicksilver, ready, reflexive, regardful, robust, running, rushing, scrupulous, smacking, snappy, spanking, spirited, sprightly, spry, stirring, strenuous, strong, supple, take-charge, take-over, transitional, traveling, trenchant, true, vibrant, vigorous, vivacious, vivid, voice, wide-awake, working, zestful, zesty, zingy, zippy
Bouvier's Law Dictionary, Revised 6th Ed (1856):

ACTIVE. The opposite, of passive. We say active debts, or debts due to us; passive debts are those we owe.