Tesellation or Tessellation: How To spell?
The word Tesellation is misspelled against Tessellation, a noun meaning "The act of tessellating; also, the mosaic work so formed."
Tessellation has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings te & ellation which should not be misspelled with single 'S'
Wrong Spelling:  te-s-ellation  Correct Spelling:  te-ss-ellation 
Find more incorrect spellings of Tessellation to spell right way.