A relation between a dul:SocialObject (the 'meaning') and a dul:InformationObject (the 'expression'). For example: 'A Beehive is a structure in which bees are kept, typically in the form of a dome or box.' (Oxford dictionary)'; 'the term Beehive expresses the concept Beehive in my apiculture ontology'. The intuition for 'meaning' is intended to be very broad. A separate, large comment is included in the encoding of 'expresses', for those who want to investigate more on what kind of meaning can be represented in what form.