John Woldemar Cowan, The Complete Lojban Language (2016)
“ The same part of speech is used to represent the relationship. In formal logic this whole structure is called a “predication”; in Lojban it is called a bridi, and the central part of speech is the selbri. Logicians refer to the things thus related as “arguments”, while Lojbanists call them sumti. These Lojban terms will be used for the rest of the book. In a relationship, there are a definite number of things being related. In English, for example, “give” has three places: the donor, the recipient and the gift. For example: Example 2.4 John gives Sam the book. ”
