grand vs unknown

grand

noun
  • A thousand of some unit of currency, such as dollars or pounds. (Compare G.) 

  • A grand piano 

  • A grandparent or grandchild. 

adj
  • Of a large size or extent; great. 

  • Standing in the second or some more remote degree of parentage or descent (see grand-). 

  • Having higher rank or more dignity, size, or importance than other persons or things of the same name. 

  • Fine; lovely. 

  • Containing all the parts proper to a given form of composition. 

  • Great in size, and fine or imposing in appearance or impression; illustrious, dignified, magnificent. 

unknown

noun
  • A variable (usually x, y or z) whose value is to be found. 

  • A person of no identity; a nonentity 

  • Any thing, place, or situation about which nothing is known; an unknown fact or piece of information. 

adj
  • Not known; unidentified; not well known. 

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