noun
a sign (¨) placed over a vowel, indicating that it is sounded separately from the preceding vowel
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The diaeresis is a diacritical mark placed over a vowel to indicate that it is pronounced separately.
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The diaeresis in the word 'naïve' tells us to pronounce the two vowels separately.
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I always forget to include the diaeresis when typing words like 'coöperate'.
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The diaeresis in her name symbolizes the uniqueness of her identity.