General

• Class (education)
  Class (education)
  A class in education has a variety of related meanings.It can be the group of students which attends a specific course or lesson at a university, school or other educational institution, see Form ....
  
  , a group of students attending a specific course or lesson
  • Lesson
    Lesson
    A lesson is a structured period of time where learning is intended to occur. It involves one or more students being taught by a teacher or instructor...
    
    s, in education
  • Classroom
    Classroom
    A classroom is a room in which teaching or learning activities can take place. Classrooms are found in educational institutions of all kinds, including public and private schools, corporations, and religious and humanitarian organizations...
    
    
• Class (philosophy)
  Class (philosophy)
  Philosophers sometimes distinguish classes from types and kinds. We can talk about the class of human beings, just as we can talk about the type , human being, or humanity...
  
  , an analytical concept used differently to group phenomena from grouping as 'types' or 'kinds'
• Class (set theory)
  Class (set theory)
  In set theory and its applications throughout mathematics, a class is a collection of sets which can be unambiguously defined by a property that all its members share. The precise definition of "class" depends on foundational context...
  
  , a set of sets came to be called a "class" as a result of work by Bertrand Russell and others in mathematics
• The degree of the dual
  Dual curve
  In projective geometry, a dual curve of a given plane curve C is a curve in the dual projective plane consisting of the set of lines tangent to C. There is a map from a curve to its dual, sending each point to the point dual to its tangent line. If C is algebraic then so is its dual and the degree...
  
   of a curve, in mathematics
• Class (social)
  Social class
  Social classes are economic or cultural arrangements of groups in society. Class is an essential object of analysis for sociologists, political scientists, economists, anthropologists and social historians. In the social sciences, social class is often discussed in terms of 'social stratification'...
  
  , the hierarchical arrangement of individuals in society, usually defined by material wealth and occupation
• Travel class
  Travel class
  A travel class is a quality of accommodation on public transport. The accommodation could be a seat or a cabin for example. Higher travel classes are more comfortable and more expensive.-Airline booking codes:...
  
  , a quality of accommodation on public transport
• Classes of United States Senators
  Classes of United States Senators
  The three classes of United States Senators are currently made up of 33 or 34 Senate seats. The purpose of the classes is to determine which Senate seats will be up for election in a given year. The three groups are staggered so that one of them is up for election every two years.A senator's...
  
  , for describing the schedules of elections for Senate seats
• Class (biology)
  Class (biology)
  In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...
  
  , a taxonomic rank in biological classification
• Hazard class, dangerous goods classification
• Ship class
  Ship class
  A ship class is a group of ships of a similar design. This is distinct from a ship-type, which might reflect a similarity of tonnage or intended use. For example, the is a nuclear aircraft carrier of the Nimitz class....
  
  , group of ships of similar design

Media and entertainment

• Character class
  Character class
  In role-playing games, a common method of arbitrating the capabilities of different game characters is to assign each one to a character class. A character class aggregates several abilities and aptitudes, and may also sometimes detail aspects of background and social standing or impose behaviour...
  
   in role-playing games and other genres
• Class (film)
  Class (film)
  Class is a 1983 American movie that was directed by Lewis John Carlino, the writer/director of the 1979 film The Great Santini. It features the film debuts of actors Andrew McCarthy, John Cusack, Virginia Madsen, Lolita Davidovich, and Alan Ruck....
  
  , a romantic comedy released in 1983
• Class (1998 film), an independent film co-produced by Steve Howey
  Steve Howey (actor)
  Steven Michael Robert "Steve" Howey is an American film and television actor, best known for his role as Van Montgomery in the television series Reba. His roles also include the films Supercross, DOA: Dead or Alive, and Bride Wars...
  
  
• Class: A Guide Through the American Status System, a book by Paul Fussell
  Paul Fussell
  Paul Fussell is an American cultural and literary historian, author and university professor. His writings cover a variety of genres, from scholarly works on eighteenth-century English literature to commentary on America’s class system...
  
  
• The Class (TV series), a CBS sitcom
• The Class (2007 film), an Estonian film
• The Class (2008 film)
  The Class (2008 film)
  The Class is a 2008 French drama film directed by Laurent Cantet. Its original French title is Entre les murs, which translates literally to "Between the walls". It is based on the 2006 novel of the same name by François Bégaudeau...
  
   (Entre les murs), a prize-winning French film
• The Class (Erich Segal novel), 1985
• "Class," a song in the Broadway musical, Chicago
  Chicago (musical)
  Chicago is a musical set in Prohibition-era Chicago. The music is by John Kander with lyrics by Fred Ebb and a book by Ebb and Bob Fosse. The story is a satire on corruption in the administration of criminal justice and the concept of the "celebrity criminal"...
  
  
• Class 95FM, a Singaporean radio channel
• Class (TV series)
  Class (TV series)
  Class is a British television programme, which airs on CBBC. It is a comedy sketch shows, which is set in a school. The main characters are all played by Sam Nixon and Mark Rhodes who are one of CBBC's most popular duos...
  
  , a British television programme, which airs on CBBC

Computing

• Class (computer programming), or type of object, a fundamental concept of object-oriented programming
• Java class file, the interpretable bytecode of a compiled Java program
• Class attribute, a feature of many HTML and XHTML elements, typically to identify them for styles
• Complexity class
  Complexity class
  In computational complexity theory, a complexity class is a set of problems of related resource-based complexity. A typical complexity class has a definition of the form:...
  
  , a set of problems of related complexity in computational complexity theory
• Class (warez)
  Class (warez)
  CLASS was a notorious and prolific warez group that existed between January 1, 1997 and January 9, 2004. The group was the repeated target of federal raids such as Operation Fastlink. They specialized in cracked games, and sometimes had elaborate art in the cracktro or release...
  
  , a defunct group in the warez scene

Railroads

• Class (locomotive)
  Class (locomotive)
  Class refers to a group of locomotives built to a common design for a single railroad. Often members of a particular class had detail variations between individual examples, and these could lead to subclasses. Sometimes technical alterations move a locomotive from one class to another...
  
  , a single design of a locomotive as assigned by the railroad
• Classification of United States railroads:
  • Class I railroad
    Class I railroad
    A Class I railroad in the United States and Mexico, or a Class I rail carrier in Canada, is a large freight railroad company, as classified based on operating revenue.Smaller railroads are classified as Class II and Class III...
    
    
  • Class II railroad
    Class II railroad
    A Class II railroad in the United States is a mid-sized freight-hauling railroad, in terms of its operating revenue. , a railroad with revenues greater than $20.5 million but less than $277.7 million for at least three consecutive years is considered a Class II railroad...
    
    
  • Class III railroad
    Class III railroad
    A Class III railroad, as defined by the Surface Transportation Board, is a railroad with an annual operating revenue of less than $20 million . The term only applies to United States railroads, but is sometimes applied to other countries...