American Heritage Dictionary
(2)
Century Dictionary
(4)
GNU Webster's 1913
(2)
WordNet
(1)
Elsewhere on the web
They like the warmth of such installations to copulate (look it up).— Dagney's Rant
French animal law stated that when a human and a non-human creature copulate, both must be hung by the neck until dead -- regardless of the fact that the animal was just standing there practically begging to be plowed.— Cracked: All Posts
Brooke did indeed "copulate" first with a man at the Orchard.— The Independent - Frontpage RSS Feed

American Heritage Dictionary (1)
Century Dictionary (2)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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