Plain English Meaning
The FAA's legal permission slip to fly. It says who you are, what kind of flying you are allowed to do, and what aircraft you are qualified to fly.
Full Definition
An official credential issued by the FAA that authorizes the holder to act as pilot of an aircraft, with privileges and limitations defined by the certificate level (such as Student, Sport, Recreational, Private, Commercial, or Airline Transport Pilot) and any associated category, class, and type ratings.
Context Anchor
Seen when the Airplane Flying Handbook explains the FAA’s role in setting pilot requirements and issuing approvals to fly.
Derivation
From Latin certificare, 'to make certain.' A pilot certificate is the FAA's formal way of making certain — on paper — that the holder has met the required standards to fly.