What is the meaning of Singlestick?

A one-handed wooden stick used for fencing in place of a sword.

A martial art, sport or exercise using a cudgel or backsword.

Allanson-Winn, R. G. et al. (2006). Broadsword and Singlestick: With Chapters on Quarter-Staff, Bayonet, Cudgel, Shillalah, Walking-Stick, Umbrella, and Other Weapons of Self-Defense. Paladin Press. →ISBN

Source: wiktionary.org