1. significant, considerable, or meaningful assistance; help that is important in quantity or quality
The government provided substantial help to families affected by the disaster.
O governo forneceu ajuda substancial às famílias afetadas pelo desastre.
2. aid that makes a real difference or has a significant impact on a situation
Her mentor's substantial help was crucial to her career advancement.
A ajuda substancial de sua mentora foi crucial para seu avanço na carreira.