PLATO, Meno: Definition
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(1) A definition is an answer to such questions as:
‘what is the nature of x?’ ‘What is virtue?’
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(2) A definition focuses upon a common nature, an eidos (72a-c)
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(3) A definition states what is the same in a number of things, i.e. the
definiendum. (72d)
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(4) A definition seeks to define a thing by means of a unique definite
description, or to understand the structure of an eidos that is common to
several things. (cf. 75b and 76a)
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(5) Definition seeks the single thing that runs through and is common to
many particulars (74a-b).
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(6) It is possible to define with respect to one thing (the idea) what it is
to be one of a set of things.
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(7) A common name among many things is possible only because they
have a common nature, and the name refers to that common nature.
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(8) Definition looks for that which is the same element common to all
these things that bear a common name. (75a)