Strong's #6666: tsdaqah (pronounced tsed-aw-kaw')
 from 6663; rightness (abstractly), subjectively (rectitude), objectively (justice), morally (virtue) or figuratively (prosperity):--justice, moderately, right(-eous) (act, -ly, -ness).
Brown-Driver-Briggs Hebrew Lexicon:
 
  tsedâqâh 
 
 1) justice, righteousness
 
 1a) righteousness (in government)
 
 1a1) of judge, ruler, king
 1a2) of law
 1a3) of Davidic king Messiah
 
 1b) righteousness (of God' s attribute)
 1c) righteousness (in a case or cause)
 1d) righteousness, truthfulness
 1e) righteousness (as ethically right)
 1f) righteousness (as vindicated), justification, salvation
 
 1f1) of God
 1f2) prosperity (of people)
 
 1g) righteous acts
 
  Part of Speech: noun feminine
Relation: from H6663
Usage:
This word is used 157 times:
Psalms 103:6: "The LORD executeth  righteousness and judgment for all that are oppressed."
Psalms 103:17: "to everlasting upon them that fear  him, and his righteousness unto children's children;"
Psalms 106:3: "are they that keep judgment, and he that doeth  righteousness at all times."
Psalms 106:31: "And that was counted  unto him for righteousness unto all generations forevermore."
Psalms 111:3: "His work is honorable and glorious:  and his righteousness endureth forever."
Psalms 112:3: "Wealth and riches shall be in his house:  and his righteousness endureth forever."
Psalms 112:9: "He hath dispersed, he hath given to the poor;  his righteousness endureth forever; his horn shall be exalted"
Psalms 119:40: "I have longed after thy precepts: quicken  me in thy righteousness."
Psalms 119:142: " Thy righteousness is an everlasting righteousness, and thy law is the truth."
Psalms 143:1: "my supplications: in thy faithfulness answer  me, and in thy righteousness."
Psalms 143:11: "Quicken me, O LORD, for thy name's sake:  for thy righteousness' sake bring my soul out of trouble."
Psalms 145:7: "of thy great goodness, and shall sing  of thy righteousness."
Proverbs 8:18: "are with me; yea, durable riches  and righteousness."
Proverbs 8:20: "I lead in the way  of righteousness, in the midst of the paths of judgment:"
Proverbs 10:2: "of wickedness profit nothing:  but righteousness delivereth from death."
Proverbs 11:4: "not in the day of wrath:  but righteousness delivereth from death."
Proverbs 11:5: " The righteousness of the perfect shall direct his way: but the wicked shall fall by his own wickedness."
Proverbs 11:6: " The righteousness of the upright shall deliver them: but transgressors shall be taken in their own naughtiness."
Proverbs 11:18: "a deceitful work: but to him that soweth  righteousness shall be a sure reward."
Proverbs 11:19: "As  righteousness tendeth to life: so he that pursueth evil pursueth it to his own death."
Proverbs 12:28: "In the way  of righteousness is life; and in the pathway thereof there is no death."
Proverbs 13:6: " Righteousness keepeth him that is upright in the way: but wickedness overthroweth the sinner."
Proverbs 14:34: " Righteousness exalteth a nation: but sin is a reproach to any people."
Proverbs 15:9: "unto the LORD: but he loveth him that followeth after  righteousness."
Proverbs 16:8: "Better is a little  with righteousness than great revenues without right."
Proverbs 16:12: "for the throne is established  by righteousness."
Proverbs 16:31: "of glory, if it be found in the way  of righteousness."
Proverbs 21:3: "To do  justice and judgment is more acceptable to the LORD than sacrifice."
Proverbs 21:21: "He that followeth  after righteousness and mercy findeth life, righteousness, and honor."
Proverbs 21:21: "and mercy findeth life,  righteousness, and honor."
Isaiah 1:27: "shall be redeemed with judgment, and her converts  with righteousness."
Isaiah 5:7: "for judgment, but behold oppression;  for righteousness, but behold a cry."
Isaiah 5:16: "and God that is holy shall be sanctified  in righteousness."
Isaiah 5:23: "for reward, and take away  the righteousness of the righteous from"
Isaiah 9:7: "to order it, and to establish it with judgment  and with justice from henceforth even forever."
Isaiah 10:22: "the consumption decreed shall overflow  with righteousness."
Isaiah 28:17: "Judgment also will I lay to the line,  and righteousness to the plummet: and the hail shall sweep away the refuge"
Isaiah 32:16: "Then judgment shall dwell in the wilderness,  and righteousness remain in the fruitful field."
Isaiah 32:17: "And the work  of righteousness shall be peace; and the effect of righteousness quietness and assurance"
Isaiah 32:17: "shall be peace; and the effect  of righteousness quietness and assurance forever."
Isaiah 33:5: "he hath filled Zion with judgment  and righteousness."
Isaiah 33:15: "He that walketh  righteously, and speaketh uprightly; he that despiseth the gain of oppressions, that shaketh"
Isaiah 45:8: "let the earth open, and let them bring forth salvation,  and let righteousness spring up together; I"
Isaiah 45:23: "by myself, the word is gone out of my mouth  in righteousness, and shall not return, That"
Isaiah 45:24: "Surely, shall one say, in the LORD  have I righteousness and strength: even to him shall men come; and all"
Isaiah 46:12: "unto me, ye stouthearted, that are far  from righteousness:"
Isaiah 46:13: "I bring near  my righteousness; it shall not be far off, and my salvation shall not tarry: and I will place"
Isaiah 48:1: "of Israel, but not in truth, nor  in righteousness."
Isaiah 48:18: "then had thy peace been as a river,  and thy righteousness as the waves of the sea:"
Isaiah 51:6: "in like manner: but my salvation shall be forever,  and my righteousness shall not be abolished."