Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
centrepiece is a noun meaning "the central or most important feature". It carries 2 recorded senses.
the central or most important feature
“education was the centerpiece of the Democratic Party's political platform”
Canada · United Kingdom
something placed at the center of something else (as on a table)
Canada · United Kingdom
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 centrepiece come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.