dilation
n. C1 Advanced US //ˌdaɪˈɫeɪʃən// UK //daɪlˈeɪʃən// di·la·tion
n. the act of making something larger or wider. In math, it means changing the size of a shape while keeping its shape the same.
n. the process of increasing the size or extent of something. In a mathematical context, it refers to a transformation that scales an object from a fixed point without altering its shape.
The dilation of the pupil allows more light to enter the eye.
The architect used a dilation of the original blueprint to create a larger model for the presentation.
In topology, the dilation of a set by a certain radius involves adding all points within that distance to the original set, effectively expanding its boundary.
From dilate + -ion, late 16th c.