n.1. A mechanical device that sometimes resembles a human and is capable of performing a variety of often complex human tasks on command or by being programmed in advance.
2. A machine or device that operates automatically or by remote control.
3. A person who works mechanically without original thought, especially one who responds automatically to the commands of others.
Word History: Robot is a word that is both a coinage by an individual person and a borrowing. It has been in English since 1923 when the Czech writer Karel

apek's play
R.U.R. was translated into English and presented in London and New York.
R.U.R., published in 1921, is an abbreviation of
Rossum's Universal Robots;
robot itself comes from Czech
robota, "servitude, forced labor," from
rab, "slave." The Slavic root behind
robota is
orb-, from the Indo-European root
*orbh-, referring to separation from one's group or passing out of one sphere of ownership into another. This seems to be the sense that binds together its somewhat diverse group of derivatives, which includes Greek
orphanos, "orphan," Latin
orbus, "orphaned," and German
Erbe, "inheritance," in addition to the Slavic word for slave mentioned above. Czech
robota is also similar to another German derivative of this root, namely
Arbeit, "work" (its Middle High German form
arabeit is even more like the Czech word).
Arbeit may be descended from a word that meant "slave labor," and later generalized to just "labor."