majority vs secret ballot

majority

noun
  • The difference between the winning vote and the rest of the votes. 

  • Ancestors; ancestry. 

  • More than half (50%) of some group. 

  • The office held by a member of the armed forces in the rank of major. 

secret ballot

noun
  • The voting system involving ballots available only at official polling places, prepared at public expense, containing the names of all candidates, and marked in secret at the polling places. 

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