Yes, CONNECTION is a Scrabble word!

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

Is it a valid word?

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

a relation between things or events (as in the case of one causing the other or sharing features with it)
the state of being connected
an instrumentality that connects
(usually plural) a person who is influential and to whom you are connected in some way (as by family or friendship)
the process of bringing ideas or events together in memory or imagination
a connecting shape
a supplier (especially of narcotics)
shifting from one form of transportation to another
the act of bringing two things into contact (especially for communication)