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Dilation is the noun for that becoming-wider: pupil dilation, the dilation of blood vessels, the dilation of the cervix in labour. Same medical world as . Some older or more formal texts say dilatation; that is a longer twin with the same idea, not a different meaning. In class you will almost always see dilation.
擴張（作用或現象）；眼科的散瞳也是一種 dilation。
原始詞典資料4 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。
dilationnoun/daɪˈleɪʃən/
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The act of dilating.
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State of being dilated; expansion; dilatation.
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obsoleteDelay.
- The wise queen, however she might seem to have a fair opportunity offered to her suit, finds it not good to apprehend it too suddenly; as desiring by this small dilation to prepare the ear and heart of the king for so important a request
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mathematicssciencesIn morphology, a basic operation (denoted ⊕) that usually uses a structuring element for probing and expanding the shapes contained in the input image.
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。