Dilaation
Dilaation, usually written as dilatation or dilation, denotes the act of widening or expanding an opening, passage, or structure. The term comes from Latin dilatatio; in American English dilation is common, while British usage often prefers dilatation. The form dilaation is typically considered a misspelling.
In medicine, dilatation describes widening of a body opening: cervical dilatation occurs during labor to allow
In geometry and physics, dilation refers to the transformation that scales objects relative to a center point
The term is widely used in ophthalmology, obstetrics, physiology, and geometry; precise spelling should be chosen