Generically, placing lines of text in a particular relationship to one or both margins. As distinct from flush left or flush right, justified text has both the left and right margins even.
A block of text that has been spaced so that the text aligns on both the left and right margins. Justified text has a more formal appearance, but may be harder to read.
To adjust the length of the line so that it is flush left and right on the measure. Type is commonly set either justified or FL/RR (flush left, ragged right).