Having a substance; actually existing.
A guide to substantial
• Not imaginary; real; actual; true; veritable.
• Corporeal; material; firm.
• Having good substance; strong; stout; solid; firm.
• Addressing the substance of an injury
• Possessed of goods or an estate; moderately wealthy.
• Large in size, quantity, or value; ample; significant.
• Most important; essential.
• Satisfying; having sufficient substance to be nourishing or filling.
(Noun) Anything having substance; an essential part.
Why substantial is relevant in U.S. law
substantial appears in U.S. legal practice across multiple practice areas. Knowing what it means — and when it applies — can determine the outcome of motions, filings, and negotiations. For non-lawyers, the value of looking up a precise definition is that legal terms often carry meanings that differ from everyday usage; relying on the common meaning can lead to costly missteps.
When and how substantial applies
In practice, substantial is invoked when parties, judges, or attorneys need to identify the legal status of an issue, the rights of those involved, or the procedural step required next. The definition shown above is sourced from Wiktionary , which is widely cited in U.S. legal practice. Because U.S. law is jurisdictionally layered — federal, state, and sometimes local — the precise application of the term can vary by court, so check the controlling authority for your specific case.