Synonyms:
dilation, dilatation
Meaning: the act of expanding an aperture; "the dilation of the pupil of the eye"
Synonyms:
dilatation, distension, distention
Meaning: the state of being stretched beyond normal dimensions
Usage examples
All the phenomena of dilatation and contraction were nearly the same, when, instead of common air, I used nitrous air, fixed air, inflammable air, or any species of phlogisticated common air.