Longman Dictionary of Contemporary English
Wiktionary
n. (context schools UK English) A school which provides education for children in Key Stage 2, i.e. for four academic years from September after a child's 7th birthday.
WordNet
n. British school for children aged 7-11
Wikipedia
A Junior school is a type of school which provides primary education to children, often in the age range from 8 and 12, following attendance at Infant school which covers the age range 5-7. (As both Infant and Junior schools are giving Primary Education pupils are commonly placed in a unified building housing the age ranges of both Infants and Juniors - a Primary school).
Usage examples of "junior school".
Being Finnish and with suicide being so common in that country that they teach antidote administration at junior school, she immediately knocked the bottle out of his hand and poured bottle after bottle of Evian down him till the paramedics came.
When the visitors' lot outside Laker Broome's private entrance had filled, the parents had driven past it over the grass and parked their cars all along the yellow-green length of lawn which we often took as our way down to the Junior School for lunch.
She had taught history and English at the Mannenberg junior school until the headmaster had married her, and she had given him four children, all daughters.
If his flashing memories were correct, it went back to junior school.
Surprisingly resilient, smiled Helen, given Sam had made it at junior school and for two weeks had insisted on washing it up herself, MUM.
When I first went to the junior school, I learned that the sons of maharajahs and princes sometimes covet the property of others to the point of stealing it, and are at least as clever at lying as the English.
There were three or four cars lined up outside the junior school gates.
She went with her teacher to look at it, and she saw, with leaping heart, her name neatly typed out underneath the picture: PRECIOUS RAMOTSWE (10) (MOCHUDI GOVERNMENT JUNIOR SCHOOL).