continuous vs occasional

continuous

adj
  • Expressing an ongoing action or state. 

  • Not deviating or varying from uniformity; not interrupted; not joined or articulated. 

  • Such that, for every x in the domain, for each small open interval D about f(x), there's an interval containing x whose image is in D. 

  • Without stopping; without a break, cessation, or interruption. 

  • Without intervening space; continued. 

  • Such that each open set in the target space has an open preimage (in the domain space, with respect to the given function). 

occasional

adj
  • Acting in the indicated role from time to time. 

  • Created for a specific occasion. 

  • Occurring or appearing irregularly from time to time, but not often. 

  • Intended for use as the occasion requires. 

noun
  • A person who does something only occasionally. 

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