Origin of causal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1530s, from Latin causalis "relating to a cause," from causa (see cause (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper