Definition of "Class" :
noun: education imparted in a series of lessons or meetings
"Flirting is not unknown in college classes."
noun: elegance in dress or behavior
"She has a lot of class."
noun: people having the same social, economic, or educational status
"The working class."
noun: a collection of things sharing a common attribute
"There are two classes of detergents."
noun: (biology) a taxonomic group containing one or more orders
noun: a body of students who are taught together
"Early morning classes are always sleepy."
noun: a body of students who graduate together
"The class of '97."
noun: a league ranked by quality
"He played baseball in class D for two years."
verb: arrange or order by classes or categories
"How would you classify these pottery shards--are they prehistoric?."