century vs decade

century

noun
  • A period of 100 consecutive years; often specifically a numbered period with conventional start and end dates, e.g., the twentieth century, which stretches from (strictly) 1901 through 2000, or (informally) 1900 through 1999. The first century AD was from 1 to 100. 

  • A unit in ancient Roman army, originally of 100 army soldiers as part of a cohort, later of more varied sizes (but typically containing 60 to 70 or 80) soldiers or other men (guards, police, firemen), commanded by a centurion. 

  • A hundred runs scored either by a single player in one innings, or by two players in a partnership. 

  • A political division of ancient Rome, meeting in the Centuriate Assembly. 

  • A hundred things of the same kind; a hundred. 

  • A score of one hundred points. 

  • A banknote in the denomination of one hundred dollars. 

  • A race a hundred units (as meters, kilometres, miles) in length. 

decade

noun
  • A period of ten years , particularly such a period beginning with a year ending in 0 and ending with a year ending in 9. 

  • Any of the sets of ten sequential braille characters with predictable patterns. 

  • A group, set, or series of ten 

  • A period of ten days, (history) particularly those in the ancient Egyptian, Coptic, and French Revolutionary calendars. 

  • A series of prayers counted on a rosary, typically consisting of an Our Father, followed by ten Hail Marys, and concluding with a Glory Be and sometimes the Fatima Prayer. 

  • A set of resistors, capacitors, etc. connected so as to provide even increments between one and ten times a base electrical resistance. 

  • The interval between any two quantities having a ratio of 10 to 1. 

  • A set of ten electronic devices used to represent digits. 

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