copula vs hinge

copula

noun
  • A device that connects two or more keyboards of an organ. 

  • 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. 

  • A function that represents the association between two or more variables, independent of the individual marginal distributions of the variables. 

  • The act of copulation; mating. 

hinge

noun
  • A jointed or flexible device that allows the pivoting of a door etc. 

  • A principle, or a point in time, on which subsequent reasonings or events depend. 

  • One of the four cardinal points, east, west, north, or south. 

  • A stamp hinge, a folded and gummed paper rectangle for affixing postage stamps in an album. 

  • The median of the upper or lower half of a batch, sample, or probability distribution. 

  • A movement that presents itself as rotation when an off-centre fixed point is taken into account. 

  • A naturally occurring joint resembling such hardware in form or action, as in the shell of a bivalve. 

verb
  • To depend on something. 

  • The breaking off of the distal end of a knapped stone flake whose presumed course across the face of the stone core was truncated prematurely, leaving not a feathered distal end but instead the scar of a nearly perpendicular break. 

  • To attach by, or equip with a hinge. 

  • To move or already be positioned in such a fashion that it presents itself as rotation when an off-centre fixed point is taken into account. 

How often have the words copula and hinge occurred in a corpus of books? (source: Google Ngram Viewer )