Class definition

klăs
A set, collection, group, or configuration containing members regarded as having certain attributes or traits in common; a kind or category.
noun
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A division based on quality, rank, or grade, as:
  • A grade of mail.
    A package sent third class.
  • A quality of accommodation on public transport.
    Tourist class.
noun
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High social rank or caste.
noun
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(biology) A taxonomic category ranking below a phylum or division and above an order.
noun
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The division of society into ranks or castes.
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A group of people considered as a unit according to economic, occupational, or social status; esp., a social rank or caste.

The working class, the middle class.

noun
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(statistics) An interval in a frequency distribution.
noun
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The definition of a class is a group of people or things with something in common.

An example of a class is the third grade.

noun
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Conscripted troops, or men liable to conscription, all of whom were born in the same year.

Called up the class of 1952

noun
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(biol.) A major category in the classification of animals, plants, etc., ranking above an order and below a division or phylum: it can include one order or many similar orders: the Latinized class names are capitalized but not italicized (Ex.: Mammalia, mammals)
noun
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To put in a class; classify.
verb
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First-class; very good.
adjective
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Elegant; classy.
adjective
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Classification.
abbreviation
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(biology) A taxonomic category ranking below a phylum or division and above an order.
noun
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(statistics) An interval in a frequency distribution.
noun
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A taxonomic category of organisms ranking above an order and below a phylum or division. In modern taxonomic schemes, the names of classes end in –phyceae for the various groups of algae, –mycetes for fungi, and –opsida for plants (as in Liliopsida, the class of plants also termed monocotyledons). The names of classes belonging to phyla of the animal kingdom, however, are formed in various ways, as Osteichthyes the bony fishes, Aves, the birds, and Mammalia, the mammals, all of which are classes belonging to the subphylum Vertebrata (the vertebrates) in the phylum Chordata.
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A group of students who are taught together, usually at a regularly scheduled time and in the same subject.
noun
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A division or grouping according to grade or quality.

As orators, the two councilors were not in the same class.

noun
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(linguistics) A group of words belonging to the same grammatical category that share a particular set of morphological properties, such as a set of inflections.
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(mathematics) A collection of sets whose members share a specified property.
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A social stratum whose members share certain economic, social, or cultural characteristics.

The lower-income classes.

noun
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Social rank or caste, especially high rank.
noun
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(informal) Elegance of style, taste, and manner.

An actor with class.

noun
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The period during which such a group meets.

Had to stay after class.

noun
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The subject material taught to or studied by such a group.

Found the math class challenging.

noun
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A group of students or alumni who have the same year of graduation.
noun
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(informal) Excellence, esp. of style or appearance.
noun
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A group of students taught together according to standing, subject, etc.
noun
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A meeting of such a group.
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A group of students graduating together.

The class of 1988

noun
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Any group of persons that share a given year, as those elected to public office or selected for some honor.
noun
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To arrange, group, or rate according to qualities or characteristics; assign to a class; classify.
verb
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A category of activities, objects, people, or qualities that have, or are considered to have, certain attributes or characteristics in common.
noun
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An identifiable group of individuals that a regulation or statute deals with or acts upon differently than it does other people. If the group is identified by gender, race, national origin, or religion, such a group is called a protected class or a suspect class. See also suspect classification.
noun
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A group of individuals who have, with the plaintiff in a civil action, a common interest in the subject, facts, and legal issues that the action is based on and who seek to collectively participate in the action so all their claims can be adjudicated in a single proceeding. For example, the passengers of a cruise ship who became ill due to the cruise line’s negligence may constitute a class.
noun
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A group of individuals who will share a testamentary gift upon the death of a testator but whose exact number and identity is not known until the testator’s death. For example, if a gift is “to my children who survive me,” it will not be known until the testator’s death who those children are. See also gift.
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Also known as custom calling services. A group of network-based services offered by local exchange carriers (LECs) through the public switched telephone network (PSTN). CLASS services include anonymous call rejection, automatic callback, calling name delivery, calling number delivery, calling number blocking, call waiting, distinctive ringing, call trace, ring again, selective call acceptance, selective call forwarding, selective call rejection, and selective call screening. For more detail, see also the preceding terms.
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In the traditional public switched telephone network (PSTN) hierarchy, a regional toll center. The 10 Class 1 offices that existed prior to the breakup of the Bell System served to interconnect Class 2 offices, or sectional toll centers. At the end of 2001, seven remained in the United States, and two in Canada. See Figure C-3. See also Bell System, Class 2, and PSTN.
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In the traditional public switched telephone network (PSTN) hierarchy, a sectional toll center. Class 2 offices served to interconnect Class 3 offices, or primary toll centers, largely for interstate calling within a geographic region of North America. Approximately 67 sectional toll centers existed prior to the breakup of the Bell System. It is doubtful that any remain. See also Bell System, Class 3, and PSTN.
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In the traditional public switched telephone network (PSTN) hierarchy, a primary toll center. Class 3 offices served to connect Class 4 offices for intrastate toll calling, and to interconnect independent telcos and the Bell operating companies (BOCs). Approximately 200 Class 3 offices existed prior to the breakup of the Bell System. It is doubtful that any remain. See also Bell System, BOC, Class 4, independent telephone company, and PSTN.
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In the traditional public switched telephone network (PSTN) hierarchy, a tandem toll center. Class 4 offices serve to interconnect Class 5 offices, or central offices (COs) not interconnected directly.As the lowest class of toll center, Class 4 offices interconnect within a relatively local toll network and provide access to higher-order toll centers. In the contemporary PSTN, a Class 4 office commonly serves as a Class 5 office, as well, with the separate functions provided through logical and physical partitioning within the switch. See also Class 4/5, Class 5, CO, and PSTN.
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A local central office (CO), which is the lowest class switching office in the public switched telephone network (PSTN) hierarchy. A Class 5 office is the point at which subscriber local loops and network trunks terminate and interconnect. Synonymous with central office (CO), central office exchange (COE), and end office. See also CO, end office, and PSTN.
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(countable) A group, collection, category or set sharing characteristics or attributes.
noun
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To divide into classes, as students; to form into, or place in, a class or classes.
noun
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(Ireland, UK, slang) Great; fabulous.
adjective
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(gram.) In some languages, the formal classification by which nouns are grouped according to animateness, sex, shape, and other criteria.
noun
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To arrange, group, or rate according to qualities or characteristics; assign to a class; classify.
verb
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A number of people or things grouped together because of certain likenesses or common traits; kind; sort; category.
noun
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A set, collection, group, or configuration containing members regarded as having certain attributes or traits in common; a kind or category.
noun
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Other Word Forms

Noun

Singular:
class
Plural:
classes

Origin of class

  • French classe from Latin classis class of citizens kelə-2 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From French classe, from Latin classis (“a class or division of the people, assembly of people, the whole body of citizens called to arms, the army, the fleet, later a class or division in general”)

    From Wiktionary