degree of order
Physics term for the extent to which a system is ordered, often used in thermodynamics and statistical mechanics.
この系の秩序度は温度に依存する。
The degree of order of this system depends on temperature.
order parameter
Physics term for a parameter that measures the degree of order in a phase transition, such as magnetization in a ferromagnet.
秩序度は相転移の記述に用いられる。
The order parameter is used to describe phase transitions.
Compound of 秩序 (order) and 度 (degree). The exact historical derivation is uncertain, but the term is used in modern physics contexts.