Strong's #1345: dikaioma (pronounced dik-ah'-yo-mah)
 from 1344; an equitable deed; by implication, a statute or decision:--judgment, justification, ordinance, righteousness.
Thayer's Greek Lexicon:
 ́ 
 
  dikaiōma 
 
 1) that which has been deemed right so as to have force of law
 
 1a) what has been established, and ordained by law, an ordinance
 1b) a judicial decision, sentence
 
 1b1) of God
 
 1b1a) either the favourable judgment by which he acquits man and declares them acceptable to Him
 1b1b) unfavourable: sentence of condemnation
 
 2) a righteous act or deed
 
  Part of Speech: noun neuter
Relation: from G1344
  Citing in TDNT: 2:219, 168
 
Usage:
This word is used 10 times:
Luke 1:6: "the commandments and  ordinances of the Lord blameless."
Romans 1:32: "Who knowing the  judgment of God, that they which commit such things"
Romans 2:26: "uncircumcision keep the  righteousness of the law, shall not his"
Romans 5:16: "is of many offenses unto  justification."
Romans 5:18: "condemnation; even so by  the righteousness of one the free gift came upon all"
Romans 8:4: "That the  righteousness of the law might be fulfilled in us,"
Hebrews 9:1: "first covenant had also  ordinances of divine service, and a worldly sanctuary."
Hebrews 9:10: "washings, and carnal  ordinances, imposed on them until the time of reformation."
Revelation 15:4: "thee; for thy  judgments are made manifest."
Revelation 19:8: "fine linen is the  righteousness of saints."