isochronous vs synchronous

isochronous

adj
  • Happening at the same time; simultaneous. 

  • Happening at regular intervals; isochronal. 

  • of or pertaining to data associated with time-sensitive applications. 

  • Of or pertaining to the use of clocks derived from the same clock reference. 

synchronous

adj
  • At the same time, at the same frequency. 

  • Single-threaded; blocking; occurring in the same thread as other computations, thereby preventing those computations from resuming until the communication is complete. 

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