Diairesis
Encyclopedia
Diaeresis is used as a technical term in Platonic and Stoic philosophy.

Plato's method of definition

Diaeresis is a method of definition
Definition
A definition is a passage that explains the meaning of a term , or a type of thing. The term to be defined is the definiendum. A term may have many different senses or meanings...

 based on partitition which occurs in the Platonic dialogues Phaedrus
Phaedrus (Plato)
The Phaedrus , written by Plato, is a dialogue between Plato's main protagonist, Socrates, and Phaedrus, an interlocutor in several dialogues. The Phaedrus was presumably composed around 370 BC, around the same time as Plato's Republic and Symposium...

, Sophist
Sophist (dialogue)
The Sophist is a Platonic dialogue from the philosopher's late period, most likely written in 360 BCE. Having criticized his Theory of Forms in the Parmenides, Plato presents a new conception of the forms in the Sophist, more mundane and down-to-earth than its predecessor...

, Statesman and Philebus
Philebus
The Philebus , composed between 360 and 347 BC, is among the last of the late Socratic dialogues of the ancient Greek philosopher Plato. Socrates is the primary speaker in Philebus, unlike in the other late dialogues...

. It is a means of reaching a definition by which a large group is continually divided into relatively equal parts until the definition has been found.

A complementary term is merismos (cf. English merism
Merism
In rhetoric, a merism is a figure of speech by which a single thing is referred to by a conventional phrase that enumerates several of its parts, or which lists several synonyms for the same thing....

: parsing or the distinguishing of parts, as opposed to diairesis, which is the division of a genus into its parts).

For example, in the Sophist (§235B), the Eleatic Stranger is examining illusions, which consist of words and "visual objects." By using diaeresis, he divides visual objects, by which it becomes clear he means works of art, into two categories: eikastikē technē
Techne
Techne, or techné, as distinguished from episteme, is etymologically derived from the Greek word τέχνη which is often translated as craftsmanship, craft, or art. It is the rational method involved in producing an object or accomplishing a goal or objective...

, the art of making likenesses or eikones; and phantastikē technē, the art of creating illusionary appearances. The Stranger is much more fond of the former; the latter are only created to produce an appearance of beauty.

The method of diaeresis was taken up and developed by Plato's nephew and successor Speusippus
Speusippus
Speusippus was an ancient Greek philosopher. Speusippus was Plato's nephew by his sister Potone. After Plato's death, Speusippus inherited the Academy and remained its head for the next eight years. However, following a stroke, he passed the chair to Xenocrates. Although the successor to Plato...

.

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