Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
plagiarised is an adjective meaning "copied and passed off as your own". It carries one recorded sense.
copied and passed off as your own
“used plagiarized data in his thesis”
“a work dotted with plagiarized phrases”
Definitions, synonyms and semantic relations for plagiarised come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.