say it: uh-THAW-ruh-teez
authorities is a noun meaning "the organization that is the governing authority of a political unit". It carries one recorded sense.
the organization that is the governing authority of a political unit
“the government reduced taxes”
“the matter was referred to higher authorities”
government
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 authorities 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.