literal vs surd

literal

adj
  • Following the letter or exact words; not free; not taking liberties 

  • Consisting of, or expressed by, letters (of an alphabet) 

  • (broadly) That which generally assumes that the plainest reading of a given scripture is correct but which allows for metaphor where context indicates it; (specifically) following the historical-grammatical method of biblical interpretation 

  • Used non-literally as an intensifier; see literally for usage notes. 

  • Exactly as stated; read or understood without additional interpretation; according to the letter or verbal expression; real; not figurative or metaphorical, and etymonic rather than idiomatic. 

  • Unimaginative; matter-of-fact 

noun
  • A misprint (or occasionally a scribal error) that affects a letter. 

  • A value, as opposed to an identifier, written into the source code of a computer program. 

  • A propositional variable or the negation of a propositional variable. ᵂᵖ 

surd

adj
  • unvoiced; voiceless 

  • Involving surds, or irrational numbers; not capable of being expressed in rational numbers. 

noun
  • An irrational number, especially one expressed using the √ symbol. 

  • A voiceless consonant. 

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