Full Idea
I maintain that a universal is not something real that exists in a subject [of inherence], either inside or outside the mind, but that it has being only as a thought-object in the mind.
Gist of Idea
A universal is not a real feature of objects, but only a thought-object in the mind
Source
William of Ockham (Ordinatio [1320], DII Qviii prima redactio)
Book Reference
Ockham,William of: 'Ockham's Philosophical Writings', ed/tr. Boehner,P [Hackett 1990], p.41
A Reaction
[A footnote says that William later abandoned this view] I don't see a clear distinction here between having real existence in the mind, and being a thought-object in the mind. Maybe we should say 'merely' a thought-object?