What is 'gentleman' in Italian?

Signore is an Italian equivalent of 'gentleman'. It's a masculine gender noun that takes as its definite article 'il' ['the'] and as its indefinite article 'uno' ['a, one']. It's pronounced 'see-NYOH-ray'.

Another equivalent is gentiluomo. It's a masculine gender noun that's pronounced 'jehn-tee-LWOH-moh'. It's formed from the combination of the adjective 'gentile' ['polite, courteous'] and the masculine gender noun 'uomo' ['man'].