From exesti (in the sense of ability); privilege, i.e. (subjectively) force, capacity, competency, freedom, or (objectively) mastery (concretely, magistrate, superhuman, potentate, token of control), delegated influence -- authority, jurisdiction, liberty, power, right, strength.

see GREEK exesti

1. power of choice, liberty of doing as one pleases; leave or permission: 1 Corinthians 9:12, 18; ἔχειν ἐξουσίαν, 2 Thessalonians 3:9; with an infinitive added indicating the thing to be done, John 10:18; 1 Corinthians 9:4; Hebrews 13:10 (WH brackets ἐξουσία); followed by an infinitive with τοῦ, 1 Corinthians 9:6 (L T Tr WH omit τοῦ); with a genitive of the thing or the person with regard to which one has the power to decide: Romans 9:21 (where an explanatory infinitive is added (Buttmann, 260 (224))); 1 Corinthians 9:12; ἐπί τό ξύλον τῆς ζωῆς, permission to use the tree of life, Revelation 22:14 (see ἐπί, C. I. 2 e.); ἐξουσίαν ἔχειν περί τοῦ ἰδίου θελήματος (opposed to ἀνάγκην ἔχειν (cf. Winer's Grammar, § 30, 3 N. 5)), 1 Corinthians 7:37; ἐν τῇ ἰδίᾳ ἐξουσία (appointed, see τίθημι, 1 a. sub at the end) according to his own choice, Acts 1:7; ἐν τῇ σῇ ἐξουσία ὑπῆρχεν, i. e. at thy free disposal, Acts 5:4; used of liberty under the gospel, as opposed to the yoke of the Mosaic law, 1 Corinthians 8:9.

2. "physical and mental power; the ability or strength with which one is endued, which he either possesses or exercises": Matthew 9:8; Acts 8:19; Revelation 9:3, 19; Revelation 13:2, 4; Revelation 18:1; followed by an infinitive of the thing to be done, Mark 3:15; Luke 12:5; John 1:12; Revelation 9:10; Revelation 11:6; Revelation 13:5; followed by τοῦ with the infinitive Luke 10:19; αὕτη ἐστιν ἡ ἐξουσία τοῦ σκότους, this is the power that darkness exerts, Luke 22:53; ποιεῖν ἐξουσίαν to exert power, give exhibitions of power, Revelation 13:12; ἐν ἐξουσία εἶναι, to be possessed of power and influence, Luke 4:32; also ἐξουσίαν ἔχειν (both expressions refer to the ability and weight which Jesus exhibited in his teaching) Matthew 7:29; (Mark 1:22); κατ' ἐξουσίαν powerfully, Mark 1:27; also ἐν ἐξουσία, Luke 4:36.

3. the power of authority (influence) and of right: Matthew 21:23; Mark 11:28; Luke 20:2; spoken of the authority of an apostle, 2 Corinthians 10:8; 2 Corinthians 13:10; of the divine authority granted to Jesus as Messiah, with the infinitive of the thing to be done, Matthew 9:6; Mark 2:10; Luke 5:24; John 5:27; ἐν ποίᾳ ἐξουσία; clothed in what authority (i. e. thine own or God's?), Matthew 21:23, 24, 27; Mark 11:28, 29, 33; Luke 20:2, 8; delegated authority (German Vollmacht, authorization): παρά τίνος, with the genitive of the person by whom the authority is given, or received, Acts 9:14; Acts 26:10, 12 (R G).

4. the power of rule or government (the power of him whose will and commands must be submitted to by others and obeyed (generally translated authority));

a. universally: Matthew 28:18; Jude 1:25; Revelation 12:10; Revelation 17:13; λαμβάνειν, ἐξουσίαν ὡς βασιλεύς, Revelation 17:12; εἰμί ὑπό ἐξουσίαν, I am under authority, Matthew 8:9; with τασσόμενος added, (Matthew 8:9 L WH brackets); Luke 7:8; ἐξουσία τίνος, the genitive of the object, authority (to be exercised) over, as τῶν πνευμάτων τῶν ἀκαθάρτων, Mark 6:7; with ὥστε ἐκβάλλειν αὐτά added, Matthew 10:1; ἐξουσίαν πάσης σαρκός, authority over all mankind, John 17:2 (πάσης σαρκός κυρειαν, Bel and the Dragon, verse 5); (the genitive of the subject, τοῦ Σατανᾶ, Acts 26:18); ἐπί τινα, power over one, so as to be able to subdue, drive out, destroy, Revelation 6:8; ἐπί τά δαιμόνια, Luke 9:1; or to hold submissive to one's will, Revelation 13:7; ἐπί τάς πληγάς, the power to inflict plagues and to put an end to them, Revelation 16:9; ἐπί τῶν ἐθνῶν, over the heathen nations, Revelation 2:26; ἐπί τίνος, to destroy one, Revelation 20:6; ἔχειν ἐξουσίαν ἐπί τοῦ πυρός, to preside, have control, over fire, to hold it subject to his will, Revelation 14:18; ἐπί τῶν ὑδάτων, Revelation 11:6; ἐπάνω τίνος ἐξουσίαν ἔχειν, to be ruler over a thing, Luke 19:17.

b. specifically, α. of the power of judicial decision; ἐξουσίαν ἔχειν with an infinitive of the thing decided: σταυρῶσαι and ἀπολῦσαι τινα, John 19:10; followed by κατά τίνος, the power of deciding against one, John 19:11; παραδοῦναι τινα ... τῇ ἐξουσία τοῦ ἡγεμόνος, Luke 20:20. β. of authority to manage domestic affairs: Mark 13:34.

c. metonymically, α. a thing subject to authority or rule: Luke 4:6; jurisdiction: ἐκ τῆς ἐξουσίας ἡδωρου ἐστιν, Luke 23:7 (1 Macc. 6:11 (cf. Psalm 113:2 (); Isaiah 39:2)). β. one who possesses authority; (cf. the Latin use ofhonestates,dignitates,auctoritates (so the English authorities, dignities, etc.) in reference to persons); αα. a ruler, human magistrate (Dionysius Halicarnassus 8, 44; 11, 32): Romans 13:1-3; plural: Luke 12:11; Romans 13:1; Titus 3:1. ββ. the leading and more powerful among created beings superior to man, spiritual potentates; used in the plural of a certain class of angels (see ἀρχή, δύναμις, θρόνος, κυριότης): Colossians 1:16; 1 Peter 3:22 (cf. Fritzsche on Romans, vol. ii., p. 226f; (Lightfoot on Colossians, the passage cited)); with ἐν τοῖς ἐπουρανίοις added, Ephesians 3:10; πᾶσα ἐξουσία, 1 Corinthians 15:24; Ephesians 1:21; Colossians 2:10; used also of demons: in the plural, Ephesians 6:12; Colossians 2:15; collectively (cf. Lob. ad Phryn., p. 469), ἡ ἐξουσία τοῦ ἀέρος (see ἀήρ), Ephesians 2:2; τοῦ σκότους, Colossians 1:13 (others refer this to 4 a. (or c. α.) above (cf. Luke 22:53 in 2), and regard σκότος as personified; see σκότος, b.).

d. a sign of the husband's authority over his wife, i. e. the veil with which propriety required a woman to cover herself, 1 Corinthians 11:10 (as βασιλεία is used by Diodorus 1, 47 for the sign of regal power, i. e. a crown). (Synonym: see δύναμις, at the end. On the infinitive after ἐξουσία, and ἐξουσία ἔχειν cf. Buttmann, 260 (223f).)