Is century a word in the Scrabble Dictionary

Yes, century is playable

...and is worth 14 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Century" Definition

noun

A group of 100 things.
A period of 100 years.
A unit of the Roman army originally consisting of 100 men.
Each of the successive periods of 100 years before or since the advent of the Christian era.
One of the 193 electoral divisions of the Roman people.