Falsetto is a male singing voice that's unusually high. It's a voice so high it sounds false. A guy singing a mean falsetto could break a wine glass!
Falsetto is a musical term for a male voice that's artificially high. Falsetto means “artificial voice” and comes from the Italian word falso for “false.” When men suddenly sing way up high above their speaking voices, it can sound almost fake. This word can also be used as an adjective — you could say he's a falsetto singer or a certain part should be sung with a falsetto voice. When you see the word falsetto, think "high voice."