Definition 1 of 2
Plain English Meaning
A landing the pilot didn't plan to make, carried out because something has gone wrong and the aircraft must come down soon — sometimes in a field, on a road, or anywhere flat enough to put it down safely.
Full Definition
An unplanned landing made because continued flight is no longer possible or safe, most commonly due to engine failure or another in-flight emergency. The pilot must land the aircraft as safely as possible at the nearest suitable site, which may or may not be an airport.
Context Anchor
Used in emergency procedures, especially when discussing engine failure, loss of power, or landing away from an airport.
Derivation
From 'forced' (compelled, with no choice) and 'landing.' The name captures the key idea: the pilot is not choosing when or where to land — circumstances are forcing the decision.