Strong's #2888: kosmokrator (pronounced kos-mok-fat'-ore)
from 2889 and 2902; a world-ruler, an epithet of Satan:--ruler.
Thayer's Greek Lexicon:
1) lord of the world, prince of this age
1a) the devil and his demons
Part of Speech: noun masculine
Relation: from G2889 and G2902
Citing in TDNT: 3:913, 466
This word is used 1 times:
Ephesians 6:12: "against powers, against the rulers of the darkness of this"