From Longman Dictionary of Contemporary Englishpreschoolpre‧school1, pre-school /ˈpriːskuːl/ adjectiveSEPrelating to the time in a child’s life before they are old enough to go to schoolpreschool childrenExamples from the Corpuspreschool• Between 1987 and 1992, the number of preschool children living in poverty increased from 5 to 6 million.• Mattel Media also will createmultimedia games for its HotWheelsracingtoys and several preschool games.• They may also fill out preschoolworksheetsintended as preparation for kindergarten reading and math.• In the preschool years, dads' involvement with their school-age children also yields continuing dividends in intellectual and social development.• The right-brain compensatoryability seems to be lost for most of us sometime in the preschool years.