Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
offertory is a noun meaning "the offerings of the congregation at a religious service". It carries 2 recorded senses.
the offerings of the congregation at a religious service
the part of the Eucharist when bread and wine are offered to God
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 offertory come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.