preschool

Short definition from Wiktionary

Adjective

1. 1
   Of or relating to the years of early childhood before attendance at primary school.

Noun

1. 1
   A nursery school.
2. 2
   A school including nursery and kindergarten. It is succeeded by elementary school.

Verb

1. 1
   To provide nursery school education for.
2. 2
   To undergo nursery school education.