/.d7nstifi'keiʃ(ə)n/ noun1. a reason which shows that something has been done correctly O What was his justifica- tion for doing that? O They tried to find some justification for what they had done. 2. (in typing and printing) arranging the words in the lines so that the right-hand edge is straight O An American hyphenation and jus- tification program will not work with British English spellings.