Full Idea
It is necessary that we look to the primary conception corresponding to each word and that it stand in no need of demonstration, if, that is, we are going to have something to which we can refer the object of search or puzzlement and opinion.
Gist of Idea
If we are to use words in enquiry, we need their main, unambiguous and uncontested meanings
Source
Epicurus (Letter to Herodotus [c.293 BCE], 38)
Book Reference
Epicurus: 'The Epicurus Reader', ed/tr. Inwood,B. /Gerson,L. [Hackett 1994], p.6
A Reaction
This either points to definition or to consensus, and since definition seems in danger of some sort of Quinean circularity, I favour consensus. Philosophy is, after all, people discussing things, not inscriptions sent to the gods.