Job advertisement: "Liaise professionally" Australian academic job advertisements often ask for candidates to show they can liaise professionally with people in certain other academic roles.  What sort of experience or achievements are they looking for?
This one is pretty easy. The requirement that you've mentioned simply asks for some proof, at least, informal one, that a person is capable to successfully facilitate professional interactions by communicating with people from various subject domains and convert ideas and information between domain "languages". In other words, successfully act as a subject domain translator.

The simplest example of such role from the industry would be a business analyst, which most often requires to translate requirements and other project information between business-focused groups and IT-focused ones. Roles of project / product / program manager are related, though different.

Therefore, to meet such requirement, which is very typical for both academia and industry due to their collaborative nature of work, I would say that listing successful projects (with specifying roles and relevant tasks &amp; achievements of facilitating interdisciplinary cooperation) in a CV is enough.