Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
oni is a noun meaning "the military intelligence agency that provides for the intelligence and counterintelligence and investigative and security requirements of the United States Navy". It carries one recorded sense.
the military intelligence agency that provides for the intelligence and counterintelligence and investigative and security requirements of the United States Navy
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 oni come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.