Question: what is the meaning of the root word vi?
Answer: 10. Vi is proper Latin, and it means "with violence, violently", the ablative of vis, "force, violence", from Proto-Indo-European *u̯i-, with similar meaning, and probably related to various other roots and their reflexes. Words like vir "man", virtus "might, virtue", violo "violate" (all senses) come from *vi-.