1) to have power or authority, use power
1a) to be master of any one, exercise authority over one
1b) to be master of the body
1b1) to have full and entire authority over the body
1b2) to hold the body subject to one's will
1c) to be brought under the power of anyone
Part of Speech: verb
Citing in TDNT: 2:574, 238
From G1849; to control: - exercise authority upon, bring under the (have) power of.
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 ἐξουσιάζω; click on the second column to search for that grammatical form of the root ἐξουσιάζω; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐξουσιάζω.