Intermariage or Intermarriage: How To spell?
The word Intermariage is misspelled against Intermarriage, a noun meaning "Connection by marriage; reciprocal marriage; giving and taking in marriage, as between two families, tribes, castes, or nations."
Intermarriage has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings interma & iage which should not be misspelled with single 'R'
Wrong Spelling:  interma-r-iage  Correct Spelling:  interma-rr-iage 
Find more wrongly spelled words of Intermarriage to spell it well.