v. To pronounce a sound with the tongue against the palate of the mouth when that sound normally would not be so pronounced.
the GNU version of the Collaborative International Dictionary of English
v. To modify, as the tones of the voice, by means of the palate
The Century Dictionary and Cyclopedia
To make palatal; change from a guttural to a palatal pronunciation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. pronounce a consonant with the tongue against the palate
Word Usage
"Soon, though, you begin to recognize that the words you don't understand are in fact English: They palatalize the short e and a when they're in a stressed syllable."