Biblical: righteousness is conformity to the law of God: 1) as a human characteristic, justice and fairness in dealing with men: kho drang po dang nongs med pa zhig yod pa yin/ [Noah] was a righteous and blameless man (Gen. 6:9), skyes bu drang po dang dam pa/ a righteous and holy man (Mk. 6:20); 2) as a divine attribute, God's perfect righteousness and moral faultlessness, of which man falls short: drang po gcig kyang yod ma yin/ there is no one righteous, not even one (Rom. 3:10), kye yis ra el gyi dkon mchog ya ho wa/,,khyed thugs gzhi drang po lags/ O Lord, God of Israel, you are righteous (Ezra 9:15), skyes bu dam pa drang po la brgyab log byas/ disowned the Holy and Righteous One (Acts 3:14), ye shu ma shi ka thugs drang po lags pa/ Jesus Christ, the Righteous One (1 Jn. 2:1); 3) Christ's righteousness, imputed to men: drang po rnams gson por lang / the resurrection of the righteous (Lk. 14:14), drang po dad pas 'tsho bar 'gyur/ the just (or righteous) will live by faith (Gal. 3:11), ma shi ka drang po des sdig can log pa rnams kyi don du/ the righteous for the unrighteous (1 Pet. 3:18); 4) righteousness as an abstraction: drang ba dang /,,chos sems dang /,,dad sems dang /,,byams sems dang /,,yid brtan dang /,,dul ba/ righteousness, godliness, faith, love, endurance and gentleness (1 Tim. 6:11), drang por byams kyang ngan par sdang / loved righteousness and hated wickedness (Heb. 1:9).
Buddhist: see justice.
Cognates: 1) drang ba nyid/ righteousness; especially as an abstract characteristic: drang ba nyid tshang ma sgrub pa/ to fulfill all righteousness (Mt. 3:15), drang ba nyid kyi phyir ltogs pa dang skom pa/ to hunger and thirst for righteousness (Mt. 5:6), drang po'i go khrab/ the breastplate of righteousness (Eph. 6:14); 2) zhal che drang po/ just or fair judgement: zhal che drang por gcod par/ judges justly (Acts 17:31).
or rnam dag
Biblical: very clean, thoroughly pure; righteous: rnam par dag pa'i g.yog por gyur/ become slaves of righteousness (Rom. 6:18), bka' khrims nas byung ba'i rnam dag righteousness that is by the law (Rom. 10:5), bka' khrims kyi rnam par dag pa/ legalistic righteousness (Phil. 3:6), nga tsho'i rnam par dag pa'i las la rag ma lus par/ not depending on righteous things we had done (Tit. 3:5).
Buddhist: rnam dag [lit. very pure, thoroughly cleansed] implies purity to the point of perfection. Applied to enlightened beings, it implies complete truth, altruism, and purity (KTM). Otherwise implies a lack of faults: bstan bcos rnam dag gsum/ the three types of perfect commentary (CNG 20), skyabs 'gro rnam dag cig a pure taking of refuge (TRC 74), chos rnam dag byed pa/ pure religious practice (TRC 227).
Cognates: yang dag pa/ [lit: completely pure] see perfect.