Full Idea
We always postulate a single form for each set of particular things, to which we apply the same name.
Gist of Idea
A Form applies to a set of particular things with the same name
Source
Plato (The Republic [c.374 BCE], 596a)
Book Reference
Plato: 'Republic', ed/tr. Waterfield,Robin [OUP 1993], p.345