copulas

noun

1. 1.(grammar) A word, usually a verb, used to link the subject of a sentence with a predicate (usually a subject complement or an adverbial), that unites or associates the subject with the predicate.
2. 2.A function that represents the association between two or more variables, independent of the individual marginal distributions of the variables.
3. 3.A device that connects two or more keyboards of an organ.
4. 4.The act of copulation; mating.