say it: im-paw-si-BIL-i-tee
impossibility is a noun meaning "incapability of existing or occurring". It carries 2 recorded senses.
incapability of existing or occurring
an alternative that is not available
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 impossibility 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.