Definition
The condition of a substance, system, or component at a given moment, defined by measurable properties such as temperature, pressure, volume, position, or operating mode.
Plain English
The way something is right now — its current condition, described by what you can measure or observe about it.
Context Anchor
Seen in regulatory and international aviation phrases such as State of Registry, State of Design, and State of the Operator.
Derivation
From Latin status, meaning 'condition' or 'standing' — literally how something stands at a particular moment. The aviation and engineering meaning keeps that core idea: a snapshot of how something currently stands.
Why Pilots Care
Many aircraft procedures depend on knowing the current state of a system — gear up or down, valve open or closed, fuel liquid or vapor. Misreading the state of a system is a common source of operational error.
Intuition Check
Do not read State here as a U.S. state, such as Texas or Florida, or as the condition something is in. In this aviation use, State usually means a country or national government.
Example Sentence 1
Water can exist in three states: solid, liquid, and gas, and all three may be present in the atmosphere at the same time.
Example Sentence 2
Changes in engine state during climb required immediate adjustment of the mixture.