What is the meaning of the word "school"?

Definitions:

a body of creative artists or writers or thinkers linked by a similar style or by similar teachers noun
- the Venetian school of painting
a building where young people receive education noun
- the school was built in 1932
a large group of fish noun
- a school of small glittering fish swam by
an educational institution noun
- the school was founded in 1900
an educational institution's faculty and students noun
- the school keeps parents informed
educate in or as if in a school verb
- The children are schooled at great cost to their parents in private institutions
swim in or form a large group of fish verb
- A cluster of schooling fish was attracted to the bait
the period of instruction in a school noun
- the time period when school is in session
the process of being formally educated at a school noun
- what will you do when you finish school?