التوسط بين كمال الاتصال وكمال الانقطاع
An intermediate relation between complete connection and complete disjunction.
When the second clause neither restates nor substitutes for the first, but the two share a credible connecting feature (jāmiʿ), wāw can coordinate two independent judgments. This differs from preventing ambiguity: here the positive relation between the clauses, not fear of misreading, grounds coordination.