Answer: The most likely meaning of Greek word 'auto' is 'by itself.'
Explanation:
Prefix 'auto' means self-propelling - something that can move on its own power. As seen in this passage, word 'automobile' stands for a vehicle that can move all by itself. Similarly, 'autopilot' means that an aircraft can move without any human involvement. Some other words that contain this prefix are automotive, automatically, autofocus, etc.
