| 释义 |
ac·tive
I. \ˈaktiv, -ēv also -əv\ adjective
Etymology: Middle English, from Middle French or Latin; Middle French actif, from Latin activus, from actus (past participle of agere to act) + -ivus -ive — more at agent
1. : characterized by action rather than by contemplation or speculation
< an active man >
2. : productive of action or movement
< a dog very much awake and filled with active antagonism — Jack McLaren >
3.
a. of a verb form or voice : asserting that the person or thing represented by the grammatical subject performs the action represented by the verb
< hits in “he hits the ball” and shone in “the sun shone” are active >
— contrasted with middle and passive
b. : expressing action as distinct from mere existence or state
< “he walks” and “he walked” have active verbs >
— now used especially in the grammar of certain American Indian and African languages; compare neuter 1b, static, stative
c. of a grammatical construction : containing an active verb form
4. : quick in physical movement : of agile and vigorous habit : nimble, lively
< an animal active in burrowing >
5. : requiring vigorous action or exertion
< an interest in active sports >
6.
a. : having practical operation or results : effective
< an active law >
b. of a volcano : erupting at the present time or at intervals of a few years or having a crater that contains fluid lava — compare dormant, extinct
7.
a. : disposed to action : energetic, diligent
< to take an active interest >
b. : engaged in an action or activity : participating
< an active club member >
8. : engaged in full-time service especially in the armed forces
< ordered to active duty >
9. : marked by present operation, transaction, movement, or use
< an active coal mine >
< an active bank account >
< active titles in a publisher's catalog >
< a student's active vocabulary >
10.
a. : capable of acting or reacting especially in some specific manner or with more than ordinary vigor : reactive, activated
< active nitrogen >
< active charcoal >
b. : optically active
c. : radioactive
< an active deposit >
11. : still eligible to win the pot in poker — used of a player who has not dropped
12. : moving down the line or visiting in the set — used of couples in contredanses or square dances
13. of a disease : progressing or retrogressing
< active tuberculosis >
• ac·tive·ly \-tə̇vlē, -li\ adverb
• ac·tive·ness \-ivnə̇s, -ēv- also -əv-\ noun -es
II. noun
(-s)
1. : one that is active
< fraternity alumni and actives >
2.
a. : an active verb
b. : the active voice of a language or a form in it
III. adjective
1. : requiring the expenditure of energy
< active calcium ion uptake >
2. : of or relating to the collection, storage, and redistribution of the sun's heat especially with the aid of pumps and blowers
< an active solar energy system >
3. : functioning by the emission of radiant energy or sound
< an active sensor >
< active sonar >
4. : characterized by emission of large amounts of electromagnetic energy
< an active galactic nucleus > |