1) power of choice, liberty of doing as one pleases
1a) leave or permission
2) physical and mental power
2a) the ability or strength with which one is endued, which he either possesses or exercises
3) the power of authority (influence) and of right (privilege)
4) the power of rule or government (the power of him whose will and commands must be submitted to by others and obeyed)
4a1) authority over mankind
4b1) the power of judicial decisions
4b2) of authority to manage domestic affairs
4c1) a thing subject to authority or rule
4c2) one who possesses authority
4c2a) a ruler, a human magistrate
4c2b) the leading and more powerful among created beings superior to man, spiritual potentates
4d) a sign of the husband's authority over his wife
4d1) the veil with which propriety required a women to cover herself
4e) the sign of regal authority, a crown
Part of Speech: noun feminine
Citing in TDNT: 2:562, 238
From G1832 (in the sense of ability); privilege, that is, (subjectively) force, capacity, competency, freedom, or (objectively) mastery (concretely magistrate, superhuman, potentate, token of control), delegated influence: - authority, jurisdiction, liberty, power, right, strength.
|g supernatural power||12.44|
|(ἄρχων τῆς ἐξουσίας τοῦ ἀέρος) supernatural power||12.44|
|h right to judge||30.122|
|a authority to rule||37.35|
|c symbol of authority||37.37|
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 ἐξουσία; click on the second column to search for that grammatical form of the root ἐξουσία; click on the third column to search for that word and grammatical form; click on the total to search for the root ἐξουσία.