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Mutability is the fact that something can change, or often does change. You use it for the changing-ness of a thing: the weather, a mood, a plan, even a number in a computer program. It is a noun, so the usual shape is “the mutability of X.” It sounds a little formal; in everyday talk people more often say “it can change” or “it keeps changing.” You will meet it a lot in science and in computer work: if a value has mutability, you are allowed to it; if it does not, it must stay as it is. Though actually, writers also use it for people and for fashion — “the mutability of taste” means what we like will not sit still. The opposite idea is immutability: no changing allowed.
可變性、易變性
組成mutable + -ity. From Middle English mutabilite, from Old French mutabilite, from Latin mutabilitas.
原始詞典資料1 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。
mutabilitynoun/ˌmjuːtəˈbɪlɪti/
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The quality or state of being mutable.
- He did indeed account somewhat unfairly for this sudden change; for besides some hard and unjust surmises concerning female fickleness and mutability, he began to suspect that he owed this want of civility to his want of horses […]
- There rise authors now and then, who seem proof against the mutability of language, because they have rooted themselves in the unchanging principles of human nature.
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。