caesura vs entr'acte

caesura

noun
  • A pause or interruption in a poem, music, building, or other work of art. 

  • Using two words to divide a metrical foot. 

  • The caesura mark ‖ or ||. 

  • A break of an era or other measure of history and time; where one era ends and another begins; turning point. 

entr'acte

noun
  • Another performance, such as a piece of music or a dance, during this. 

  • An interval between two acts of a play or opera. 

How often have the words caesura and entr'acte occurred in a corpus of books? (source: Google Ngram Viewer )