Piecewise is valid Scrabble Word

Is piecewise a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is piecewise valid Words with Friends?
Words with Friends YES

9 letters word
16 points in Scrabble
18 points in WWF

Definitions for PIECEWISE in dictionary:

ADVERB:

piece by piece
By or in pieces; by degrees, piecemeal.
Mathematics. Throughout each of a finite number of separate parts or regions but not necessarily throughout the whole.
with respect to number of discrete pieces

OTHER DEFINITIONS:

with respect to a number of discrete intervals, sets, or pieces

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