- the separation of two adjacent vowels, dividing one syllable into two.
- a diacritic (¨) placed over the second of two adjacent vowels to indicate separate pronunciation, as in one spelling of the older forms naïve and coöperate: no longer widely used in English.
- the division made in a line or verse by coincidence of the end of a foot and the end of a word.
- a variant spelling of diaeresis