Dilation
A
transformation in which a figure grows larger. Dilations may be
with respect to a point (dilation
of a geometric figure) or with
respect to the axis of a graph (dilation
of a graph).
Note: Some high
school textbooks erroneously use the word dilation to
refer to all transformations in which the figure changes size,
whether the figure becomes larger or smaller. Unfortunately the
English language has no word that refers collectively to both stretching
and shrinking.
Pronunciation: Dilation (dieLAYshun) has only
three syllables, not four.
See
also
Compression, compression
of a geometric figure,
compression of a graph
