adjective
Definition: Describing something that curves around or is marked with a specific diacritical mark used in writing.
Example: The word 'côte' has a circumflex over the 'o'.
noun
Definition: A symbol used in writing, often placed over a vowel, to show how it should be pronounced or to indicate a specific tone or quality in certain languages.
Example: In French, the word 'hôtel' uses a circumflex over the 'o' to change its pronunciation.