 The theory of imposition is fundamental to Bacon’s approach (Rosier &amp; de Libéra 1986; Rosier 1994, 123–156). This allows for explicit and tacit changes of imposition of meaning in communication and points to the need for linguistic analysis and careful study of context in order to be strict about univocal meaning. Likewise, an interest in overcoming equivocation and ambiguity figures throughout Bacon’s logical works. Words can, indeed, be extended ‘metaphorically’ to cover non-existing things. In this work of Bacon, one finds a combination of influences from both the Oxford terminist logic and the Parisian pre-modist grammar of the 1240s.