A majority of the students who attend the job fair expressed interest in becoming doctors or lawyers.
What does the word "fair" in this sentence mean?
This is what "job fair" means:
Merriam-Webster "job fair"
an event where employers offer information about their companies to people who are looking for jobs
This is an extension of one of the basic meanings of "fair" as a noun:
Merriam-Webster "fair"
1 a gathering of buyers and sellers at a particular place and time for trade