The definition of solus is alone and is often used as a stage direction for a male character.
An example of solus used as an adjective is a solus speech, a speech made by a character alone on the stage.
alone: a stage direction
Origin of solusL, sole
By oneself; alone. Used as a stage direction to a male character.
Origin of solusLatin s&omacron;lus, alone; see solo.