Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sensitisation is a noun meaning "the state of being sensitive (as to an antigen)". It carries 3 recorded senses.
the state of being sensitive (as to an antigen)
(psychology) the process of becoming highly sensitive to specific events or situations (especially emotional events or situations)
psychology
rendering an organism sensitive to a serum by a series of injections
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 sensitisation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.