Strong's #4653: skotia (pronounced skot-ee'-ah)
 from 4655; dimness, obscurity (literally or figuratively):--dark(-ness).
Thayer's Greek Lexicon:
 ́ 
 
  skotia 
 
 1) darkness
 2) the darkness due to want of light
 3) metaphorically used of ignorance of divine things, and its associated wickedness, and the resultant misery in hell
 
  Part of Speech: noun feminine
Relation: from G4655
  Citing in TDNT: 7:423, 1049
 
Usage:
This word is used 16 times:
Matthew 10:27: "I tell you in  darkness, that speak ye in light: and"
Luke 12:3: "Therefore whatsoever ye have spoken in  darkness shall be heard in the"
John 1:5: "light shineth in  darkness; and the darkness comprehended"
John 1:5: "darkness; and the  darkness comprehended it not."
John 6:17: "And it was now  dark, and Jesus was not come"
John 8:12: "shall not walk in  darkness, but shall have the light"
John 12:35: "the light, lest  darkness come upon you: for he that walketh"
John 12:35: "for he that walketh in  darkness knoweth not whither he goeth."
John 12:46: "should not abide in  darkness."
John 20:1: "early, when it was yet  dark, unto the sepulcher, and"
1 John 1:5: "him is no  darkness at all."
1 John 2:8: "you: because the  darkness is past, and the true"
1 John 2:9: "brother, is in  darkness even until now."
1 John 2:11: "brother is in  darkness, and walketh in darkness,"
1 John 2:11: "and walketh in  darkness, and knoweth not whither"
1 John 2:11: "whither he goeth, because  that darkness hath blinded his eyes."