- of, constituting, or implying a cause.
- Grammar. expressing a cause, as the conjunctions because and since.
- acting as or being a cause
- stating, involving, or implying a causethe causal part of the argument
- philosophy (of a theory) explaining a phenomenon or analysing a concept in terms of some causal relation
adj.1530s, from Latin causalis “relating to a cause,” from causa (see cause (n.)).