The world's second-most spoken native language after Mandarin Chinese (7)
I believe the answer is:
spanish
(Other definitions for spanish that I've seen before include "Institution set up in 1478 by King Ferdinand and Queen Isabella to safeguard Catholic orthodoxy" , "From Valencia or Malaga?" , "His pans are from Barcelona, say" , "The nationality has his naps" , "Nationality of citizen of Malaga" .)