In the Netherlands, the equivalent term to kindergarten was kleuterschool. From the mid-19th century to the mid-20th century the term Fröbelschool was also common, after Friedrich Fröbel. However this term gradually faded in use as the verb Fröbelen gained a slightly derogatory meaning in everyday language. Until 1985, it used to be a separate non-compulsory form of education (for children aged 4–6 years), after which children (aged 6–12 years) attended the primary school (lagere school). After 1985, both forms were integrated into one, called basisonderwijs (Dutch for primary education). For children under 4, the country offers private, subsidized daycares (kinderdagverblijf), which are non compulsory but nevertheless very popular.