na-adjective
Describes something that continues without interruption or remains at a stable level. Used as a な-adjective.
この機械はコンスタントに動き続けている。
This machine keeps running constantly.
彼の成績
His grades are steady.
noun
Technical use in mathematics for a fixed value.
この式では、cはコンスタントを表す。
In this formula, c represents a constant.