Definition
A value, time, or position determined by informed calculation rather than direct measurement or observation. In aviation usage, an estimated figure is the best reasoned approximation available given current data, and is treated as provisional until confirmed.
Plain English
A best-judgment figure based on the information you have, not a measured or confirmed one. It's your considered guess, made carefully — accurate enough to plan and act on, but understood to be approximate.
Context Anchor
Seen in flight planning, weather information, position reports, and communications with air traffic control, such as an estimated arrival time or estimated fuel remaining.
Derivation
From the Latin aestimare, meaning 'to value' or 'to appraise.' The original sense was to assign a worth to something based on judgment. That sense carries directly into aviation: an estimate is a judged value, not a measured one.
Why Pilots Care
Accurate estimates directly affect fuel reserves, arrival timing, and safe decision-making during flight.
Intuition Check
Estimated does not mean exact or confirmed. It means calculated from current information and subject to change.
Example Sentence 1
The pilot reported an estimated time over the next fix of 1432 Zulu.
Example Sentence 2
Estimated fuel remaining at landing was calculated using the performance charts and actual burn rate.