(usually if not always in a Jewish atmosphere), justice, justness, righteousness, righteousness of which God is the source or author, but practically: a divine righteousness.
Strong's:
δικαιοσύνη
equity (of character or act); specially (Christian) justification Derivation: from G1342;
δικαιοσύνη, -ης, ἡ (< δίκαιος), [in LXX chiefly for צֶדֶק, and cognates, Gen.15:6, al., rarely for חֶסֶד, Gen.19:19 ;] the character of ὁ δίκαιος (which see) __1. in broad sense, righteousness, conformity to the Divine will in purpose, thought and action: Refs Mat.5:6, Jhn.16:8, Act.13:10, Rom.4:3; λόγος δικαιοσύνης, teaching of r., Heb.5:13; βασιλεὺς δ. (cf. FlJ, BJ, vi, 10, β. δίκαιος), Heb.7:2; ὅπλα δ., Rom.6:13; ὁδὸς δ., Mat.21:32; θώραξ τῆς δ., Eph.6:14; διὰκονοι δ., 2Co.11:15; ὁσιότης καὶ δ., Luk.1:75, cf. Eph.4:24; ἀγαθωσύνῃ καὶ δ., Eph.5:9; δ. κ. εἰρήνη κ. χαρά, Rom.14:17; δ. κ. ἁγιασμός, 1Co.1:30; opp. to ἁμαρτία, Rom.8:10; ἀνομία, 2Co.6:14; άδικία, Rom.3:5; ποιεῖν τὴν δ., Refs 1Jn.2:29 Jn 3:7; id. as an inclusive term for the active duties of the religious life (ICC, in l; Abbott, Essays, 73 ff), Mat.6:1; ἐργάζεσθαι δ., Act.10:35; διώκειν δ., 1Ti.6:11; πληροῦν πᾶσαν δ., Mat.3:15; ζῆν τῇ δ., 1Pe.2:24; δ. θεοῦ, a righteousness divine in its character and origin, Refs Mat.6:33, Jas.1:20, (where it also includes the idea of God's personal r.; see ICC, on Refs Rom.1:17) Rom.1:17 3:5, 21-26 10:3, 2Co.5:21, Php.3:9; ἡ δ. τ. πίσιεως, Rom.4:11; ἡ ἐκ π. δ., Rom.9:30; ἡ κατὰ π. δ., Heb.11:7; opp. to this is ἡ ἐκ νόμου δ., Rom.10:5; ἡ δ. ἐν ν., Php.3:6; ἡ ἰδία δ., Rom.10:3, cf. Php.3:9 __2. In narrower sense (cf. δίκαιος), justice: Refs Act.17:31, 2Pe.1:1, Rev.19:11 (DCG, ii, 529 ff.; Cremer, 190, 690). (AS)
Thayer:
1) in a broad sense: state of him who is as he ought to be, righteousness, the condition acceptable to God 1a) the doctrine concerning the way in which man may attain a state approved of God 1b) integrity, virtue, purity of life, rightness, correctness of thinking feeling, and acting 2) in a narrower sense, justice or the virtue which gives each his due
δικαιοσύνη
dikaiosunē
dik-ah-yos-oo'-nay
From G1342; equity (of character or act); specifically (Christian) justification
δίκαιος
dikaios
dik'-ah-yos
From G1349; equitable (in character or act); by implication innocent, holy (absolutely or relatively)
KJV Usage: just, meet, right (-eous).
G1341 δικαιοκρισίαδικαιοκρισία
dikaiokrisia
dik-ah-yok-ris-ee'-ah
From G1342 and G2920; a justsentence
KJV Usage: righteous judgment.
G1344 δικαιόωδικαιόω
dikaioō
dik-ah-yo'-o
From G1342; to render (that is, show or regard as) just or innocent
KJV Usage: free, justify (-ier), be righteous.
G1346 δικαίωςδικαίως
dikaiōs
dik-ah'-yoce
Adverb from G1342; equitably
KJV Usage: justify, (to) righteously (-ness).
G3741 ὅσιοςὅσιος
hosios
hos'-ee-os
Of uncertain affinity; properly right (by intrinsic or divine character; thus distinguished from G1342, which refers rather to human statutes and relations; from G2413, which denotes formal consecration; and from G40, which relates to purity from defilement), that is, hallowed (pious, sacred, sure)