say it: AY-kurz
acres is a noun meaning "extensive landed property (especially in the country) retained by the owner for his own use". It carries one recorded sense.
extensive landed property (especially in the country) retained by the owner for his own use
“the family owned a large estate on Long Island”
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 acres come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.