 A major shift in focus occurred in the early fourteenth century, probably occasioned by Ockham – certainly, he was the leading figure among the terminists, those who focussed “on terms as the basic unit of logical analysis” (Ashworth 2010, p. 146). On the one hand, signification came to be understood entirely extensionally, given Ockham's antipathy towards real universals. Accordingly, what was taken to be signified by a term were the things of which it can be truly predicated instead of a form or property which they share. For example, whereas hitherto the term ‘man’ had been taken to signify humanity, and ‘white’ whiteness, for Ockham the former signifies (all) men and the latter all white things. From this perspective, the contrast found in thirteenth century authors between (as Peter of Spain called it) natural supposition versus accidental supposition, becomes less important. Natural supposition was the term's natural or nomic extension, accidental supposition that range of things it supposited for in a particular proposition. For Peter, the term signifies a form, and supposits naturally for a class of objects, whereas an occurrence of the term supposits accidentally on an occasion of use for a group of those objects. For Ockham, the term signifies that class, the form being no more than a fictum (a figment of the mind) or (in his later works) the mental act (of conceiving of those things) itself.