Etymology
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whiten (v.)

c. 1300, "to make white," from white (adj.) + -en (1). Intransitive sense "become white" is from 1630s. Earlier verb was simply white (late Old English). Related: Whitened; whitening; whitener.

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Definitions of whiten

whiten (v.)
turn white;
This detergent will whiten your laundry
Synonyms: white
From wordnet.princeton.edu