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rectangular (adj.)

"right-angled, having an angle or angles of 90 degrees," 1620s, from French rectangulaire (16c.) or formed in English from Latin stem of rectangle + -ar. Of the competitor adjectives fallen lifeless about this word rectangulous (1610s) is perhaps most to be mourned. Related: Rectangularity.

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Definitions of rectangular from WordNet

rectangular (adj.)
having four right angles;
a rectangular figure twice as long as it is wide
rectangular (adj.)
having a set of mutually perpendicular axes; meeting at right angles;
a rectangular Cartesian coordinate system
Synonyms: orthogonal
From wordnet.princeton.edu