Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
defacement is a noun meaning "the act of damaging the appearance or surface of something". It carries one recorded sense.
the act of damaging the appearance or surface of something
“the defacement of an Italian mosaic during the Turkish invasion”
“he objected to the dam's massive disfigurement of the landscape”
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 defacement come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.