Definition
Wind is the horizontal movement of air relative to the surface of the Earth, caused by differences in atmospheric pressure between regions. It is described by two values: direction (the compass point the air is coming from) and speed (usually given in knots).
Plain English
Wind is air moving across the ground from one place to another. Pilots describe it by where it is blowing from and how fast it is blowing.
Context Anchor
Seen in weather reports, runway selection, takeoff and landing planning, and in-flight navigation.
Derivation
From Old English 'wind,' meaning moving air. The everyday word and the aviation word mean the same physical thing — but in aviation, wind is always reported with both a direction and a speed, never just 'windy.'
Why Pilots Care
Wind direction and speed determine crosswind limits, groundspeed, drift correction, and runway selection for safe operations.
Grounding Statement
Picture standing on a runway: if you feel air blowing into your face, that moving air is wind, and an airplane will feel it too.
Intuition Check
Do not treat wind as just “weather” or “rough air.” In this context, wind specifically means air moving horizontally, described by where it comes from and how fast it is moving.
Example Sentence 1
The ATIS reported wind 240 at 12, so the pilot selected runway 24 for departure.
Example Sentence 2
A strong headwind reduced our groundspeed and shortened the landing roll on runway 18.