Answer: The most likely meaning of Greek word 'auto' is 'by itself.'
Explanation:
Prefix 'auto' means <em>self-propelling</em> - 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 <em>automotive, automatically, autofocus</em>, etc.
