Definition
An airplane with a single set of wings, typically one wing on each side of the fuselage forming one continuous lifting surface, as distinguished from a biplane (two sets) or triplane (three sets).
Plain English
An aircraft with just one pair of wings, one on each side, instead of stacked pairs.
Context Anchor
Seen in discussions of early aircraft design and in descriptions of an airplane’s basic wing layout.
Derivation
From the Greek 'mono' meaning 'one' or 'single,' combined with 'plane' (referring to a wing surface). It literally means 'one wing,' which describes the single wing arrangement.
Why Pilots Care
The term helps pilots understand aircraft descriptions, especially when comparing older aircraft designs with the single-wing layout used on most modern airplanes.
Intuition Check
A monoplane does not mean “one airplane.” It means an airplane with one main set of wings.
Example Sentence 1
Most modern training aircraft, including the Cessna 172, are monoplanes.
Example Sentence 2
Modern airliners are almost always monoplanes because a single wing provides better efficiency than multiple wings.