dilation C2 Topic:Actions & Processes US /ˌdaɪˈleɪʃən/ UK /daɪˈleɪʃən/ See IPA manual Freq #34419 Meanings 1 noun the act of expanding an aperture The dilation of the pupil of the eye. Thesaurus Synonyms 1 noun · the act of expanding an... dilatation More delayenlargement ↔ Opposites contraction Word family Forms dilatationdilations Derived forms arteriodilationbronchodilationdilationalhyperdilationnipple-dilationoverdilationpostdilationredilationunderdilationvasodilationvenodilation Etymology From dilate + -ion, late 16th c. *telh₂- (bear) Proto-Indo-European View etymology graph -> Topics Actions & Processes Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # dilation **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /ˌdaɪˈleɪʃən/ **IPA (UK):** /daɪˈleɪʃən/ **Frequency rank:** 34419 ## Meanings 1. the act of expanding an aperture ## Examples - The dilation of the pupil of the eye. ## Synonyms - dilatation - delay - enlargement ## Antonyms - contraction ## Derived Forms - arteriodilation - bronchodilation - dilational - hyperdilation - nipple-dilation - overdilation - postdilation - redilation - underdilation - vasodilation - venodilation ## Roots and Affixes - Root: *telh₂- (bear) ## Etymology From dilate + -ion, late 16th c. ## Topics - Actions & Processes - Word Formation & Derivatives markdown