Yes, CONDITIONED is a Scrabble word!

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

Is it a valid word?

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

establish a conditioned response
develop (children's) behavior by instruction and practice; especially to teach self-control
specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement
put into a better state
apply conditioner to in order to make smooth and shiny

Also: in condition.