The spelling of the word "applicancy" can be explained using phonetic transcription. According to IPA, the word's first syllable is pronounced as "æplɪk", which sounds similar to the word "apple", but with a shorter "a" sound. The second syllable is pronounced as "ənsi", with a subtle "uh" sound and a stress on the second-to-last syllable. Overall, the spelling of "applicancy" follows typical English rules for forming nouns with the suffix "-ancy", indicating a state or quality.
The state of being applicable.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.