Plain English Meaning
The list of facts a pilot reads off in order when telling ATC where the aircraft is, when it got there, how high it is, and where it's going next.
Full Definition
The standardized set of information a pilot transmits to ATC when making a position report over a reporting point. The required items, in order, are: aircraft identification, position, time, altitude or flight level, type of flight plan (when not in radar contact), ETA and name of next reporting point, the name only of the next succeeding reporting point along the route of flight, and pertinent remarks.
Context Anchor
Seen in instrument flying when a pilot must progress along a , especially when radar contact is not or when requests a position report.