Definitions

1. verb

to become or make something larger in size or amount

“The swelling dilated to the size of a basketball.”

2. verb

to expand or widen something, such as the pupils of the eye

“Her eyes dilated in the dark room.”

3. noun

the act of dilating or becoming larger in size or amount

“The dilation of the tumor caused concern among doctors.”

4. noun

a widening or expansion of something, such as the pupils of the eye

“The dilation of her pupils was noticeable in the dim light.”