connection vs partially ordered set

connection

noun
  • A set of sets that contains the empty set, all one-element sets for any element that is included in any of the sets, and the union of any group of sets that are elements where the intersections of those sets is non-empty. 

  • A feeling of understanding and ease of communication between two or more people. 

  • sexual intercourse 

  • A kinship relationship between people. 

  • An individual who is related to oneself, through either family or business. 

  • A drug dealer. 

  • The description for a Methodist denomination as a whole, as opposed to its constituent churches, circuits, districts and conferences. 

  • Coherence; lack of disjointedness 

  • The point at which two or more things are connected. 

  • A transfer from one transportation vehicle to another in scheduled transportation service 

  • An established communications or transportation link. 

  • The act of connecting. 

partially ordered set

noun
  • A set that has a given, elsewhere specified partial order. 

  • The ordered pair comprising a set and its partial order. 

How often have the words connection and partially ordered set occurred in a corpus of books? (source: Google Ngram Viewer )