Yes, CULTIVATION is a Scrabble word!

Letter values in Scrabble US: C 3, U 1, L 1, T 1, I 1, V 4, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

CULTIVATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

socialization through training and education to develop one's mind or manners
(agriculture) production of food by preparing the land to grow crops (especially on a large scale)
a highly developed state of perfection; having a flawless or impeccable quality
the process of fostering the growth of something
the act of raising or growing plants (especially on a large scale)