Yes, partial is a Scrabble word!

Adjective

1. Being or affecting only a part; not total

2. Showing favoritism

3. (followed by `of' or `to') having a strong preference or liking for

Noun

1. The derivative of a function of two or more variables with respect to a single variable while the other variables are considered to be constant

2. A harmonic with a frequency that is a multiple of the fundamental frequency