Full Idea
If one person applies the name 'avarice' to one resemblance, and some one else to another, there will be two different species designated by the same name.
Gist of Idea
If two people apply a single term to different resemblances, they refer to two different things
Source
Gottfried Leibniz (New Essays on Human Understanding [1704], 6.6.292), quoted by Nicholas Jolley - Leibniz and Locke on Essences p.199
Book Reference
'Leibniz: Critical and Interpretive Essays', ed/tr. Hooker,Michael [Manchester 1982], p.199
A Reaction
Part of Leibniz's sustained attack on Locke's nominal essences. There is clearly an uninteresting nominal essence, where a 'big brown bear' is necessarily brown, but in the interesting respects I think Leibniz is right.