Plain English Meaning
It is the FAA's official permission slip showing what kind of pilot or aviation worker you are and what you are allowed to do.
Full Definition
An official document issued by the FAA that authorizes an individual to exercise the privileges of a specific aviation role, such as student pilot, private pilot, commercial pilot, flight instructor, or mechanic. The certificate states the type of certificate held, any associated category and class ratings, and any limitations.
Context Anchor
Seen in FAA certification discussions, practical test requirements, student pilot requirements, and pilot records.