Definition of whitens:
(v) :
(ergative) (To cause) to become white or whiter; to bleach or blanch.
(v) :
(cryptography) To increase the security of an iterated block cipher by steps that combine the data with portions of the key.
(v) :
(statistics) To normalize data so that the covariance matrix becomes the identity matrix; i.e., to remove correlations so each variable has unit variance.
(n) :
A surname.