Etymology
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motivate (v.)

"to stimulate toward action, act as the inciting cause of," 1863, from motive + -ate (2); perhaps modeled on French motiver or German motivieren. Related: Motivated; motivating.

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motivator (n.)

"someone or something that initiates or stimulates action or behavior," 1917, agent noun in Latin form from motivate (v.).

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demotivate (v.)

"cause to lose motivation; deprive of incentive to continue," by 1974; see de- + motivate. Related: Demotivated; demotivating; demotivation.

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unmotivated (adj.)
"lacking in motivation," by 1905, from un- (1) "not" + past participle of motivate. Meaning "lacking in motive" is attested from 1871. Unmotived is from 1794.
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motivation (n.)

1873, "act or process of furnishing with an incentive or inducement to action;" see motivate + -ion. Perhaps borrowed from German, where motivation is attested by 1854. Psychological use, "inner or social stimulus for an action," is from 1904.

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