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Immutability is the quality of never changing, or of being impossible to change. If something has immutability, it stays as it is: the immutability of the past (you cannot yesterday), or of a law of nature. It is a formal noun; most people just say 'it never changes'. Though actually, in computer work this word has become very common: programmers talk about the immutability of data, meaning a value the program is not allowed to — if you need a new value, you make a new copy. That specialist use is still the same idea: it must not be altered.
不變性；不可變性（程式裡常說「不可變」）
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
immutabilitynoun
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The state or quality of being immutable; immutableness.
- But, one might ask, how can the temporal event of God in our midst be the same as God's event to himself in his eternity if so absolute a distinction is drawn between the enarrable contents of history and the "eternal dynamism" of God's immutability, apatheia, and perfect fullness?
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computingengineeringmathematicsThe state of being unchangeable in the memory after creation.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。