noun
fixed value; constant value
Technical term used in mathematics, programming, and engineering to refer to a value that does not change.
このプログラムでは、税率を一定値として扱います。
In this program, the tax rate is treated as a constant value.
実験では温度を一定値に保つ必要がある。
In the experiment, the temperature must be kept at a fixed value.
変数 is a variable, the opposite of a fixed or constant value.
Compound of 一定 (fixed, constant) and 値 (value).