Verb
(transitive, sciences) To make dual, to find or consider the dual item of a given one.
(transitive, road transport) To transform into a dual carriageway.
Source: en.wiktionary.orgMore generally, one can dualize a Platonic solid with respect to a sphere of radius d concentric with the solid. Source: Internet
In fact, we merely have to dualize what was said above: free objects are given as powersets ordered by reverse inclusion, such that set union provides the meet operation, and the function f° is defined in terms of meets instead of joins. Source: Internet