0 grandson grandson [noun]US /ˈɡræn.sʌn/ UK /ˈɡræn.sʌn/ the son of one of your children Persian equivalent: Click here. Theme, CEFR level & Tags Theme: family relations in generalLevel: A2 (Elementary)Region: American EnglishBritish English Oxford Essential Dictionary grandson noun the son of your son or daughter Longman Dictionary of Contemporary English grandson grand‧son /ˈɡrænsʌn/ noun [countable] the son of your son or daughter Oxford Advanced Learner's Dictionary grandson grand·son [grandson grandsons] [ˈɡrænsʌn] [ˈɡrænsʌn] noun a son of your son or daughter compare granddaughter Cambridge Advanced Learner's Dictionary grandson grandson /ˈgrænd.sʌn/ noun [C] the son of a person's son or daughter Collins COBUILD Advanced Learner’s English Dictionary grandson /grænsʌn/ (grandsons) Someone’s grandson is the son of their son or daughter. My grandson’s birthday was on Tuesday. N-COUNT: oft with poss Merriam-Webster's Advanced Learner's Dictionary Merriam-Webster's Advanced Learner's Dictionary: grandson grand·son /ˈgrændˌsʌn/ noun, pl -sons [count] : a son of your son or daughter American EnglishBritish EnglishA2 (Elementary)grandsonnoun