Relating to something that occurs accidentally or unexpectedly.

Additional or supplementary, not essential.

अतिरिक्त या सहायक, अनिवार्य नहीं।

English Usage: The adventitious matter in the report provided some interesting insights.

Hindi Usage: रिपोर्ट में अतिरिक्त सामग्री ने कुछ रोचक अंतर्दृष्टियाँ प्रदान की।