Yes, DEDICATIONS is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, D 2, I 1, C 3, A 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

complete and wholehearted fidelity
a ceremony in which something (as a building) is dedicated to some goal or purpose
a message that makes a pledge
a short message (as in a book or musical work or on a photograph) dedicating it to someone or something
the act of binding yourself (intellectually or emotionally) to a course of action