say it: kan-suh-LAY-shuhn
cancellation is a noun meaning "the act of cancelling; calling off some arrangement". It carries 2 recorded senses.
the act of cancelling; calling off some arrangement
the speech act of revoking or annulling or making void
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 cancellation 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.