Don't use as a synonym for aligned. Justified text is text that is both left-aligned and right-aligned. To describe alignment on one margin only, use left-aligned or right-aligned, not left-justified or right-justified.
If your content has an index or a glossary that includes articles about alignment, include justify in the index or glossary with cross-references to align, left align, and right align, as appropriate.
See also left align, left-aligned, right align, right-aligned