baby boomerEnglishOxford Dictionary of Englishbaby boomer /ˈbeɪbi ˌbuːmə / ▸ noun a person born between the end of the Second World War and the early 1960s, when there was a temporary marked increase in the birth rate: America's healthcare costs are expected to soar as baby boomers become senior citizens [as modifier] these are the children of baby boomer parents.