Well, it is, too.
Justification is the more professional term for the same thing. Alignment is not that good a term, though, as all kinds of alignments are called that (left, center, right, block), so it's more of a general term while justification or full justification means block alignment.
Btw: There is no dumb question, the dumb thing would be not to ask a question if one ignores something. That's bound to keep you ignorant.