say it: dee-fawr-MAY-shuhn
deformation is a noun meaning "a change for the worse". It carries 3 recorded senses.
a change for the worse
alteration in the shape or dimensions of an object as a result of the application of stress to it
the act of twisting or deforming the shape of something (e.g., yourself)
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 deformation 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.