Definition
Fixed-wing aircraft that have a single set of wings (one wing on each side of the fuselage), as opposed to biplanes or triplanes which have stacked wings.
Plain English
Airplanes with just one pair of wings, one on the left and one on the right. Most modern aircraft are monoplanes.
Context Anchor
Seen in discussions of wing design, airplane types, and how an aircraft’s wings are arranged.
Derivation
From the Greek 'monos' meaning 'single' or 'one,' combined with 'plane' (here meaning a flat lifting surface, i.e., a wing). So 'monoplane' literally means 'one wing surface' — referring to one set of wings, not one wing in total.
Why Pilots Care
Knowing that an airplane is a monoplane helps a pilot understand basic aircraft layout, especially when comparing wing designs, visibility, handling, and performance descriptions.
Intuition Check
Monoplane does not mean single-seat or single-engine. It describes the wing arrangement: one main wing structure.
Example Sentence 1
Most general aviation trainers, including the Cessna 172 and Piper Cherokee, are monoplanes.
Example Sentence 2
Monoplanes became the dominant design because they offer less drag than earlier multi-wing aircraft.