Most basically, robot means work….
R.U.R. is a 1920 science fiction play in the Czech language by Karel Capek. R.U.R. stands for Rosumovi Univerzální Roboti (Rossum’s Universal Robots). However, the English phrase Rossum’s Universal Robots had been used as the subtitle in the Czech original. It premiered on 25 January 1921 and introduced the word “robot” to the English language and to science fiction as a whole.