na-adjective, noun which may take the genitive case particle 'no', noun
unchanging; constant; eternal; immutable
Describes something that does not change over time, such as principles, truths, or natural laws. Can be used as a noun, na-adjective, or no-adjective.
Antonyms: 可変
自然の法則は不変だ。
The laws of nature are unchanging.
彼の信念は不変のものだ。
His convictions are immutable.
noun
Mathematics term for a quantity or property that remains unchanged under a given transformation.
この式の値は変換に対して不変である。
The value of this expression is invariant under the transformation.