truncation

noun

Etymology: From Late Latin truncātiō, from Latin truncāre, past participle truncātus (“to cut off”). By surface analysis, truncate + -ion.

1. The act of truncating or shortening (for example, words are shortened to form blend words or portmanteaus).
2. The removal of the least significant digits from a decimal number.
3. An operation in any dimension that cuts a regular polytope at its vertices, creating a new facet in place of each vertex.