an vs with respect to

an

prep

  • In each; to or for each; per. 

num

  • one 

article

  • Used before one and words with initial u, eu. 

  • Used before a vowel sound. 

  • Used before all consonants. 

  • Used before /h/ in an unstressed syllable. 

  • Used before /h/ in a stressed syllable. 

noun

  • The first letter of the Georgian alphabet, ა (Mkhedruli), Ⴀ (Asomtavruli) or ⴀ (Nuskhuri). 

with respect to

prep

  • Regarding; concerning; pertaining to. 

  • Taking as the independent variable. 

How often have the words an and with respect to occurred in a corpus of books? (source: Google Ngram Viewer )