What does "signor" mean?

Alternative form of signore, a courtesy title used towards an Italian man.

What is a synonym for "signor"?

Common synonyms include: don, sahib, signior.

/ˈsiːnjɔr/ noun

noun ·Rare ·Advanced level

Noun

1
Alternative form of signore, a courtesy title used towards an Italian man. alt-of, alternative
2
used as an Italian courtesy title; can be prefixed to the name or used separately wordnet

Borrowed from Italian signor, apocopic form of signore. Doublet of senior and señor.