monologue (n.)

1660s, "long speech by one person," from French monologue, from Late Greek monologos "speaking alone," from Greek monos "single, alone" (from PIE root *men- (4) "small, isolated") + logos "speech, word," from legein "to speak," from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')."