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circular

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circular
I
circular1 /ˈsɜːkjələ, ˈsɜːkjʊlə $ ˈsɜːrkjələr/ adjective
 Word Family: noun: circle, semicircle, circulation; adjective: circular, semicircular, circulatory; verb: circle, circulate
 Date: 1300-1400
 Language: Old French
 Origin: circuler, from Late Latin circularis, from Latin circulus; circle1
1. shaped like a circle:
    a circular table
2. moving around in a circle:
    a circular bus route
3. circular argument/logic/reasoning an argument or way of thinking that is not right because the statement it uses to prove that the argument is true can only be true if the original argument is already true
—circularity /ˌsɜːkjəˈlærəti, ˌsɜːkjʊˈlærəti $ ˌsɜːr-/ noun [uncountable]

II
circular2 noun [countable]
a printed advertisement, notice etc that is sent to lots of people at the same time
     
THESAURUS
■ describing types of shapes
    square shaped like a square: a square box
    circular/round shaped like a circle: a circular table
    semicircular shaped like a semicircle: a semicircular arch above the door
    triangular shaped like a triangle: sails divided into triangular sections
    rectangular shaped like a rectangle: a simple rectangular building
    oval shaped like an oval: an oval swimming pool
    cylindrical shaped like a cylinder: The statue is on top of a tall cylindrical column.
    spherical shaped like a ball: The planet Saturn is not completely spherical.