Plain English Meaning
A special set of easier weather rules that lets a pilot fly into or out of an airport's controlled airspace when the weather isn't quite good enough for normal VFR flight. The pilot must ask air traffic control for permission, must be able to see at least one mile, and must stay out of the clouds.
Full Definition
A set of reduced visibility and cloud clearance rules that allow a pilot to operate VFR within the surface area of controlled airspace when the weather is below standard basic VFR minimums. (SVFR) requires an , at least 1 , and the must remain . SVFR is only in , C, D, and E , only during the day for most operations ( SVFR requires the pilot to be and the aircraft to be ), and is not permitted at certain busy airports listed in , Appendix D.