A class is a set of items that are in some respect alike. The most familiar, in our traditional grammar, are classes of words: verb, noun, adjective, adverb, pronoun, preposition, conjunction (and sometimes also interjection), in the usual list. But every unit can be classified: there are classes of group and phrase, classes of clause, and, at the other end of the rank scale, classes of morpheme.
A multivariate structure is a configuration of different functional relationships … . Note that, although it is the functions that are labelled, the structure actually consists of the relationships among them.
The tactic structures of complexes are relational in nature; they are the kind of structure that we have called univariate, to distinguish it from the multivariate structures … . A univariate structure is an iteration of the same functional relationship; … Such iterative structures are unique to the logical mode of meaning; they are formed out of logico-semantic relations.
