cosmos vs partial ordering relation

cosmos

noun
  • An ordered, harmonious whole. 

  • Any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously coloured flowers and pinnate leaves. 

  • The universe. 

partial ordering relation

noun
  • A partial order. 

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