Conjunctive relations typically involve contiguous elements up to the size of paragraphs, or their equivalent in spoken language; conjunction (in this sense) is a way of setting up the logical relations that characterize clause complexes in the absence of the structural relationships by which such complexes are defined.
- Halliday (1985), Pag. 289

CONJUNCTION. A clause or clause complex, or some larger stretch of text, may be related to what follows it by one or other of a specific set of semantic relations […] The most general categories are those of apposition and clarification, addition and variation, and the temporal and causal-conditional: ʻnamely; and, or, yet; then; so, thenʼ.
- Halliday (1985), Pag. 289