say it: TRUHNG-kay-shuhn
truncation is a noun meaning "the property of being truncated or short". It carries 3 recorded senses.
the replacement of an edge or solid angle (as in cutting a gemstone) by a plane (especially by a plane that is equally inclined to the adjacent faces)
the act of cutting short
“it is an obvious truncation of the verse”
“they were sentenced to a truncation of their limbs”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for truncation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.