Fallacies of Definition - Overly Broad or Narrow Definitions

Overly Broad or Narrow Definitions

A definition is no good if it defines its subject with overly wide or narrow parameters. For example, "a shape with four sides of equal length" is not a good definition for 'square'. Why? Not only squares have four sides of equal length; rhombi do as well. This is proven by identifying not only the term being defined, but also the conditions in the definition. Likewise, defining a 'rectangle' as "a shape with four perpendicular sides of equal length" is not valid because it is too narrow.

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Famous quotes containing the words overly, broad, narrow and/or definitions:

    Do not get a name as overly lavish or too inhospitable.
    Hesiod (c. 8th century B.C.)

    With a broad shoehorn
    I am unstuffing a big bird in this dream
    Msomebody else’s holiday feast—
    and repacking the crop of my own,
    knowing it will burst with such
    onion, oyster, savory bread crust.
    Maxine Kumin (b. 1925)

    ... the outcome of the Clarence Thomas hearings and his subsequent appointment to the Supreme Court shows how misguided, narrow notions of racial solidarity that suppress dissent and critique can lead black folks to support individuals who will not protect their rights.
    bell hooks (b. c. 1955)

    Lord Byron is an exceedingly interesting person, and as such is it not to be regretted that he is a slave to the vilest and most vulgar prejudices, and as mad as the winds?
    There have been many definitions of beauty in art. What is it? Beauty is what the untrained eyes consider abominable.
    Edmond De Goncourt (1822–1896)