exponential vs numeral

exponential

adj
  • Relating to an exponent. 

  • Expressed in terms of a power of e. 

  • Characterised by a very rapid rate of change, especially increase. 

  • Characterised by a rate of change that is proportional to the value of the varying quantity, or, equivalently, by a doubling or halving over successive fixed intervals of time or other parameter. 

noun
  • Any function that has an exponent as an independent variable. 

numeral

adj
  • Of or relating to numbers; numerical. 

noun
  • A number word, a simple or compound word for a number often having particular grammatical attributes depending on the language. 

  • A symbol that is not a word and represents a number, such as the Arabic numerals 1, 2, 3 and the Roman numerals I, V, X, L. 

  • A card whose rank is a number (usually including the ace as 1). 

  • A representation of a number composed of such symbols. 

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