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Dilatation (Noun)

The act of expanding an aperture; "the dilation of the pupil of the eye".

Nouns denoting acts or actions.

The ophthalmologist studied the dilation of the pupil to determine the correct lens strength for her patient's glasses.
The camera's aperture control allowed for precise dilation to adjust to changing light conditions.
The dilation of the rock opening made it possible for the hikers to squeeze through with their backpacks.
In dim light, the dilation of the iris was necessary to allow more light to enter the eye.
The pneumatic dilation of the narrow airway helped to restore normal breathing for the patient suffering from chronic respiratory issues.

The state of being stretched beyond normal dimensions.

Nouns denoting natural processes.

The medical condition caused her body to undergo extreme dilatation, making it difficult to maintain her physical form.
After a few hours of labor, the doctor checked for dilatation of the cervix to see if the woman was ready to give birth.
The rapid expansion of the universe during the Big Bang led to a significant dilatation of space itself.
As the water continued to pour into the dam, the structure underwent severe dilatation, causing concern for its stability.
During the manufacturing process, the material was subjected to extreme temperatures, resulting in an undesirable dilatation that compromised its strength.