Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
tittering is an adjective meaning "being or sounding of nervous or suppressed laughter". It carries one recorded sense.
being or sounding of nervous or suppressed laughter
Definitions, synonyms and semantic relations for tittering come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.