Plain English Meaning
Whether a pilot is legally allowed and actually capable of safely making this particular flight. It covers what they're certified to do, what they've done recently, and how well they can really fly the airplane and conditions in front of them.
Full Definition
The combination of certificates, ratings, recent flight experience, currency requirements, and demonstrated proficiency that establishes a pilot's legal authority and practical readiness to act as pilot in command for a specific flight in a specific aircraft under specific conditions.
Context Anchor
Used during preflight risk checks, especially when deciding whether the pilot is personally ready for a planned flight.