S / sōlĭlŏquĭum
noun

sōlĭlŏquĭum

gen. sōlĭlŏquii · gender neuter · decl. 2nd
solus-loquor
a talking to one's self; a soliloquy
a talking to one's self, a soliloquy, a word formed by Augustin, Aug. Solil. 2, 7 fin.