UK:*UK and possibly other pronunciationsUK and possibly other pronunciationsEnglish: /ˈsiːnjɔː/, Italian: /siɲˈɲor/

US:USA pronunciation: respellingUSA pronunciation: respelling(sēnyôr, -yōr, sin yôr, -yōr; It. sē nyôr)

WordReference Random House Unabridged Dictionary of American English © 2020
si•gnor  (sēnyôr, -yōr, sin yôr, -yōr; It. sē nyôr),USA pronunciation n., pl.  -gnors, [It.] -gno•ri 
    (sēnyôr, -yōr, sin yôr, -yōr; It. sē nyôr),USA pronunciation 
  1. a conventional Italian term of address or title of respect for a man, either used separately or prefixed to the name. Abbr.: Sig., sig.
Also,  signior. 
  • Italian; see signore1
  • 1570–80

Collins Concise English Dictionary © HarperCollins Publishers::
signor, signior /ˈsiːnjɔː; Italian: siɲˈɲor/ n ( pl -gnors, -gnori / Italian: -ˈɲori/)
  1. an Italian man: usually used before a name as a title equivalent to Mr
'signor' also found in these entries (note: many are not synonyms or translations):
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