Definition
T is the standard shorthand for temperature, a measure of how hot or cold the air (or another substance) is. In aviation it usually refers to outside air temperature, expressed in degrees Celsius unless otherwise stated, and is used in performance, weather, and weight-and-balance calculations.
Plain English
T just means temperature — how warm or cold the air is, normally measured in degrees Celsius.
Context Anchor
Seen in aviation weather reports, cockpit temperature indications, performance charts, and abbreviated aviation notices where “T” may stand for temperature.
Derivation
From the Latin temperatura, meaning 'a proper mixture' or 'moderation.' The single letter T is simply the first letter of temperature, used as a compact label on charts, instruments, and weather products where space is tight.
Why Pilots Care
Directly affects air density, engine power, lift, and required runway length; used in every takeoff and climb performance decision.
Intuition Check
Temperature does not only mean how comfortable the air feels. In aviation, it is a measured value used for planning, weather, and equipment limits.
Example Sentence 1
The METAR showed T at 32°C, so the pilot expected a longer takeoff roll than usual.
Example Sentence 2
High surface temperature reduced engine power and lengthened the required takeoff roll.