copula

noun5

1. •
   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.

   • The theory of conjunctively tensed copulae will be developed and stated with more precision in the following section. — 2002
2. •
   The bond or relationship by which two things are combined into a unity.

   • I quite correctly defined logical copulation by means [of] the copula of inclusion. — 2019
3. •
   A function that represents the association between two or more variables, independent of the individual marginal distributions of the variables.

   • There is little statistical theoretical theory for copulas. Sensitivity studies of estimation procedures and goodness-of-fit tests for copulas are unknown. — 2009
4. •
   The act of copulation; mating.
5. •
   A device that connects two or more keyboards of an organ.