Having a firm basis in reality and therefore important, meaningful, or considerable. The committee made substantive changes to the proposal to ensure its success.
Having a separate and independent existence; not subordinate. The court recognized the subsidiary as a substantive entity distinct from its parent company.
(Law) Relating to the essential rights and duties that regulate conduct, as distinguished from procedural or evidentiary rules. Substantive law determines what acts constitute a crime and the penalties for those acts.