Immemorialy or Immemorially: How To spell?
The word Immemorialy is misspelled against Immemorially, an adverb meaning "Beyond memory."
Immemorially has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings immemoria & y which should not be misspelled with single 'L'
Wrong Spelling:  immemoria-l-y  Correct Spelling:  immemoria-ll-y 
Find more incorrect spellings of Immemorially to spell right way.