say it: di-soh-see-AY-shuhn
dissociation is a noun meaning "the act of removing from association". It carries 3 recorded senses.
the act of removing from association
a state in which some integrated part of a person's life becomes separated from the rest of the personality and functions independently
(chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ions
chemistry
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 dissociation 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.