Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
deprecation is a noun meaning "a prayer to avert or remove some evil or disaster". It carries 2 recorded senses.
a prayer to avert or remove some evil or disaster
the act of expressing disapproval (especially of yourself)
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 deprecation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.