cent vs old penny

cent

noun
  • A coin having face value of one cent (in either of the above senses). 

  • A subunit of currency equal to one-hundredth of the euro. 

  • A hundredth of a semitone or half step. 

  • A small sum of money. 

  • A subunit of currency equal to one-hundredth of the main unit of currency in many countries. Symbol: ¢. 

  • A unit of reactivity equal to one hundredth of a dollar. 

old penny

noun
  • A coin worth one old penny. 

  • The pre-decimalisation United Kingdom penny, ¹⁄₂₄₀ of a pound sterling. Symbol: d 

  • The pre-decimalisation Irish penny, ¹⁄₂₄₀ of an Irish pound. Symbol: d 

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