of, constituting, or implying a cause.
Grammar. expressing a cause, as the conjunctions because and since.

1520–30; < Latin causālis, equivalent to caus(a) cause + -ālis -al1

causally, adverb
noncausal, adjective
noncausally, adverb
supercausal, adjective
uncausal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
causal (ˈkɔːzəl)
1.  acting as or being a cause
2.  stating, involving, or implying a cause: the causal part of the argument
3.  philosophy (of a theory) explaining a phenomenon or analysing a concept in terms of some causal relation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s, from L. causalis "relating to a cause," from causa (see cause). Causality is recorded from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Photography, because of its causal relationship to the world, seems to give us
  the truth or something close to the truth.
The fourth barrier comes without precise causal attribution.
Instrumental variables help to isolate causal relationships.
And the authors were careful to avoid claims about a causal relation between
  the rising temperatures and the extinctions.
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