= 5280 feet vs acre

= 5280 feet

acre

noun
  • Any of various similar units of area in other systems. 

  • An English unit of land area (symbol: a. or ac.) originally denoting a day's ploughing for a yoke of oxen, now standardized as 4,840 square yards or 4,046.86 square meters. 

  • A wide expanse. 

  • An area of 10,240 square yards or 4 quarters. 

  • A large quantity. 

How often have the words = 5280 feet and acre occurred in a corpus of books? (source: Google Ngram Viewer )