The process of enlargement, stretching, or expansion. The word "dilatation" means the same thing. Both come from the Latin "dilatare" meaning "to enlarge or expand."

Opening the pupil wide enables your eye care professional to see more of your retina, the light-sensitive layer of tissue at the back of your eye. Dilating (widening) the pupil permits the retina to be examined for signs of disease. To do this, drops are placed into the eye to dilate (widen) the pupil. After the examination, your vision may (or may [..]

The widening of something

the act of dilating or stretching.

1590s, formed from dilate on the mistaken assumption that the -ate in that word was the Latin verbal suffix (it is instead part of the stem); the proper form, dilatation, is older (c. 1400).

a transformation where a shape is made larger (or smaller if reversed) without changing its position or direction.

Enlargement or expansion of a body part

Process of enlargement.

A transformation that moves each point along the ray through the point emanating from a fixed center, and multiplies distances from the center by a common scale factor.

A transformation that enlarges or reduces a figure by a scale factor about a center point so that the original figure and its image are similar. If the scale factor is greater than 1, the dilation is [..]

(n) a lengthy discussion (spoken or written) on a particular topic(n) the act of expanding an aperture

A process by which the pupil is enlarged. Allows more light to the interior of the eye.

(n) the act of opening up wider (e.g., dilation of the pupils of the eyes, the bronchial tubes of the lungs, etc.)

An endoscopic technique to stretch out a narrowed esophagus. Dysphagia

Abnormal distention of the Stomach due to accumulation of gastric contents that may reach 10 to 15 liters. Gastric Dilatation may be the result of Gastric Outlet Obstruction; Ileus; Gastroparesis; or [..]

Use of a balloon Catheter for dilation of an occluded Artery. It is used in treatment of Arterial Occlusive Diseases, including Renal Artery Stenosis and arterial occlusions in the leg. For the specif [..]

The act of dilating. State of being dilated; expansion; dilatation. (obsolete) Delay. Bishop Hall