#2807 κλείς kleis {klice}

 from G2808; TDNT - 3:744,439; n f

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) a key
    1a) since the keeper of the keys has the power to open and to shut
    1b) metaph. in the NT to denote power and authority of various kinds

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - key 6; 6

—Exhaustive Concordance (KJV Translation Frequency & Location)