Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
jactitation is a noun meaning "speaking of yourself in superlatives". It carries 3 recorded senses.
speaking of yourself in superlatives
(law) a false boast that can harm others; especially a false claim to be married to someone (formerly actionable at law)
law
(pathology) extremely restless tossing and twitching usually by a person with a severe illness
pathology
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 jactitation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.