1) Educational institution 2) School type 1) Kindergarten 2) Playschool 
A preschool (also nursery school, kindergarten outside USA) is an educational establishment offering early childhood education to children between the ages of three and five, or seven, prior to the commencement of compulsory education at primary school. They may be privately operated or government-run, and the costs may be subsidized. ==Terminolog...
[n] - an educational institution for children too young for elementary school
noun an educational institution for children too young for elementary school
of, pertaining to, or intended for a child between infancy and school age: new methods of preschool education.