Cross-sectional and longitudinal acquisition data for English, German, Italian, and Turkish children ranging in age from approximately 1 to 4 provide a preliminary answer to the question of whether there is a consistent interlanguage order of development of notions of conjunction. It was found that children first conjoin sentences by simple juxtaposition without a surface connective, and thus the basic assumption is that notions of conjunction are acquired prior to the surface particles that mark them. With juxtaposition as a starting point, a regular order of development appears in the acquisition of the different types of semantic relationships underlying conjunction which are symmetric coordination, antithesis, sequence, and causality. Soon after the early causal statements, the first conditional notions emerge, appended to simple directives. Conditional and temporal "when" statements next appear followed by simultaneity and finally the use of "before" and "after" in subordinate clauses. The consistency of these findings across four languages strongly suggests the existence of a universal cognitive order of emergence in the acquisition of the notions underlying conjoined statements. (EJS)