1. Serving to support or corroborate
   - collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verifying

See also: supportive, verify

• interferon
• interfuse
• interfusion
• intergalactic
• intergalactic space
• intergovernmental
• intergrade
• interim
• interim overhaul
• interior
• interior angle
• interior decoration
• interior decorator
• Interior Department
• interior design
• interior designer
• interior door
• interior live oak
• interior monologue
• Interior Secretary
• interiorise
• interiority
• interiorize
• interject
• interjection