1) an image, figure, likeness
1a) an image of the things (the heavenly things)
1a1) used of the moral likeness of renewed men to God
1a2) the image of the Son of God, into which true Christians are transformed, is likeness not only to the heavenly body, but also to the most holy and blessed state of mind, which Christ possesses
1b) the image of one
1b1) one in whom the likeness of any one is seen
1b2) applied to man on account of his power of command
1b3) to Christ on account of his divine nature and absolute moral excellence
Part of Speech: noun feminine
Citing in TDNT: 2:381, 203
From G1503; a likeness, that is, (literally) statue, profile, or (figuratively) representation, resemblance: - image.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root εἰκών; click on the second column to search for that grammatical form of the root εἰκών; click on the third column to search for that word and grammatical form; click on the total to search for the root εἰκών.