The most complete glossary of backgammon terms
One turn by one player, a measure of how far a player (or computer program) looks ahead when selecting a play or evaluating a position. See post by JP White. Note: There is no agreement in the backgammon community as to whether plies are counted starting at 0 (as GNU Backgammon does it) or starting at 1 (as Snowie does it). See this thread and this thread concerning the controversy.
A feature that contributes to the strength of a position, such as made points and flexibility. Compare: Liability.