Etymology
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deactivate (v.)

also de-activate, "render inactive or less active," 1904, from de- "do the opposite of" + activate. Related: Deactivated; deactivating; deactivation.

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acting (adj.)
1590s, "putting forth activity, active," present-participle adjective from act (v.). Meaning "performing temporary duties" is from 1797.
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efficient (adj.)
late 14c., "making, producing immediate effect, active, effective," from Old French efficient and directly from Latin efficientem (nominative efficiens) "effective, efficient, producing, active," present participle of efficere "work out, accomplish," from assimilated form of ex "out" (see ex-) + facere "to do" (from PIE root *dhe- "to set, put"). Meaning "productive, skilled" is from 1787. Related: Efficiently.
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reactivate (v.)

"make active or operative again," 1902, from re- "back, again" + activate. Related: Reactivated; reactivating; reactivation.

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co-act (v.)

"to act together," c. 1600, from co- + act (v.). Related: Co-action; co-active; co-actor.

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-eme 
in linguistics, noted as an active suffix and word-formation element from 1953; from French -ème "unit, sound," from phonème (see phoneme).
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chipper (adj.)

1834, "lively, nimble, active, brisk," American English, from northern British dialectal kipper "nimble, frisky," the origin of which is obscure.

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frisky (adj.)
"gaily active," c. 1500, from Middle English adjective frisk "lively" (see frisk (v.) + -y (2). Related: Friskiness.
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night-hawk (n.)

from 1610s in reference to various birds, especially the nightjar, from night + hawk (n.). Figurative sense of "one who stays up and is active at night" is from 1818.

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demobilize (v.)
"to send home (troops) as not required for active service," 1876, probably a back-formation from demobilization (q.v.). Related: Demobilized; demobilizing.
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