caste vs partial ordering relation

caste

noun
  • A separate and fixed order or class of persons in society who chiefly associate with each other. 

  • Hyponyms: Brahmin, Kshatriya, Shudra, Vaishya, varna 

  • Any of the hereditary social classes and subclasses of South Asian societies. 

  • A class of polymorphous eusocial insects of a particular size and function within a colony. 

partial ordering relation

noun
  • A partial order. 

How often have the words caste and partial ordering relation occurred in a corpus of books? (source: Google Ngram Viewer )