A term which came from the Virtua Fighter community, but, for various reasons, including David Sirlin's Web Articles/Book on Playing to Win, it has spread to all fighting
games.
Yomi is a
Japanese term meaning "Knowing the
mind of the opponent", and is essentially an intangible asset required in fighting games. It's the ability to know what your opponent is going to do, and act appropriately. Whether you achieve this by "conditioning" the opponent to act one way, and then acting in another way, or simply
work your way into the head of your opponent, yomi is just that: the ability to know what your opponent is going to do.