rec vs relaxation

rec

noun
  • A recreation ground. 

  • A recommendation or suggestion. 

verb
  • To recommend. 

  • To record. 

relaxation

noun
  • The act of relaxing or the state of being relaxed; the opposite of stress or tension; the aim of recreation and leisure activities. 

  • The transition of a nucleus, atom or molecule from a higher energy level to a lower one; the opposite of excitation 

  • The release following musical tension. 

  • A diminution of tone, tension, or firmness; specifically in pathology: a looseness; a diminution of the natural and healthy tone of parts. 

  • Remission of attention or application. 

  • Unbending; recreation; a state or occupation intended to give mental or bodily relief after effort. 

  • Remission or abatement of rigor. 

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