Definition of class noun from the Oxford Advanced Learner's Dictionary

Oxford3000

class

noun
klɑːs
 
; klæs
 
 
 

in education

1 [countable + singular or plural verb] a group of students who are taught togetherWe were in the same class at school.She is the youngest in her class.He came top of the class.The whole class was/were told to stay behind after school.2 [countable, uncountable] an occasion when a group of students meets to be taught
Synonym
lesson
I was late for a class.See me after class.She works hard in class(= during the class).I have a history class at 9 o'clock.
3 [countable] also classes [plural] a series of classes on a particular subject
Synonym
course
I've been taking classes in pottery.Are you still doing your French evening class?
4 [countable + singular or plural verb] (especially North American English) a group of students who finish their studies at school, college or university in a particular yearthe class of 2008
 

in society

5 [countable + singular or plural verb] one of the groups of people in a society that are thought of as being at the same social or economic levelthe working/middle/upper classThe party tries to appeal to all classes of society.the professional classes6 [uncountable] the way that people are divided into different social and economic groupsdifferences of class, race or genderthe class systema society in which class is more important than ability
 

group of people/animals

7 [countable] a group of people, animals or things that have similar characteristics or qualitiesIt was good accommodation for a hotel of this class.different classes of drugsDickens was in a different class from (= was much better than) most of his contemporaries.As a jazz singer she's in a class of her own(= better than most others). see also first-class, high-class, low-class, second-class
 

skill/style

8 [uncountable] an elegant quality or a high level of skill that is impressiveShe has class all right—she looks like a model.There's a real touch of class about this team.
 

in train/plane

9 [countable] (especially in compounds) each of several different levels of comfort that are available to travellers in a plane, etcHe always travels business class.The first-class compartment is situated at the front of the train. see also business class, economy class syndrome, first class, second-class, third-class, tourist class
 

of university degree

10 [countable] (especially in compounds) one of the levels of achievement in a British university degree exama first-/second-/third-class degree
 

biology

11 [countable] a group into which animals, plants, etc. that have similar characteristics are divided, below a phylum compare family, genus, species
Idioms
see
the chattering classes at chatter v.
Usage noteUsage note: EducationLearningacquire/get/lack (an) education/training/(British English) (some) qualificationsreceive/provide somebody with training/tuitiondevelop/design/plan a curriculum/(especially British English) course/(North American English) program/syllabusgive/go to/attend a class/lesson/lecture/seminarhold/run/conduct a class/seminar/workshopsign up for/take a course/classes/lessonsSchoolgo to/start preschool/kindergarten/nursery schoolbe in the first, second, etc. (North American English) grade/(especially British English) year (at school)study/take/drop history/chemistry/German, etc.(British English) leave/finish/drop out of/(North American English) quit school(North American English) graduate high school/collegeProblems at schoolbe the victim/target of bullying(British English) play truant from/(both British English, informal) bunk off/skive off school (= not go to school when you should)(both especially North American English) skip/cut class/school(British English) cheat in/(North American English) cheat on an exam/a testget/be given a detention (for doing something)be expelled from/be suspended from schoolWork and examsdo your homework/(British English) revision/a project on somethingwork on/write/do/submit an essay/a dissertation/a thesis/an assignment/(North American English) a paperfinish/complete your dissertation/thesis/studies/courseworkhand in/(North American English) turn in your homework/essay/assignment/paperstudy/prepare/(British English) revise/(North American English) review/(North American English, informal) cram for a test/an examtake/(both British English) do/sit a test/an exam(especially British English) mark/(especially North American English) grade homework/a test(British English) do well in/(North American English) do well on/(informal, especially North American English) ace a test/an exampass/fail/(informal, especially North American English) flunk a test/an exam/a class/a course/a subjectUniversityapply to/get into/go to/start college/(British English) universityleave/graduate from law school/college/(British English) university (with a degree in computer science)study for/take/(British English) do/complete a law degree/a degree in physics(both North American English) major/minor in biology/philosophyearn/receive/be awarded/get/have/hold a master's degree/a bachelor's degree/a PhD in economics