jitter vs vellication

jitter

noun
  • A nervous action; a tic. 

  • A state of nervousness. 

  • An abrupt and unwanted variation of one or more signal characteristics. 

  • A program or routine that performs jitting; a just-in-time compiler. 

  • A random positioning of data points to avoid visual overlap. 

verb
  • To position data points randomly to avoid visual overlap. 

  • To be nervous. 

vellication

noun
  • A spasm or twitch. 

  • An instance of tickling or minor irritation. 

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