1) injustice, of a judge
2) unrighteousness of heart and life
3) a deed violating law and justice, act of unrighteousness
Part of Speech: noun feminine
Citing in TDNT: 1:153, 22
From G94; (legal) injustice (properly the quality, by implication the act); moral wrongfulness (of charater, life or act): - iniquity, unjust, unrighteousness, wrong.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ἀδικία; click on the second column to search for that grammatical form of the root ἀδικία; click on the third column to search for that word and grammatical form; click on the total to search for the root ἀδικία.