Constant

Constant has several clearly distinct meanings across disciplines.

Meanings

Constant (mathematics) — a value that does not change within a given context or equation
Constant (programming) — a data element in Software whose value cannot be modified after initialization
Constant (physics) — a measured quantity believed to be unchanging across space and time, such as the speed of light
Constant (chemistry) — a fixed ratio or equilibrium value in chemical reactions
Constant (general) — something that remains stable, reliable, or perpetually present