Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
cognisance is a noun meaning "having knowledge of". It carries one recorded sense.
having knowledge of
“he had no awareness of his mistakes”
“his sudden consciousness of the problem he faced”
“their intelligence and general knowingness was impressive”
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 cognisance come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.