As nouns the difference between coition and copulation
is that coition
is sexual intercourse while copulation
is (countable) the act of coupling or joining; union; conjunction.
(countable) The act of coupling or joining; union; conjunction.
(uncountable) Sexual procreation between a man and a woman or transfer of the sperm from male to female; usually applied to the mating process in nonhuman animals; coitus; coition.
* See also