1.defensive structure consisting of walls or mounds built around a stronghold to strengthen it
2.the art or science of strengthening defenses
3.the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)
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Rules to play 9 ball Pool
If the shooter legally pockets any ball on a shot (except a push out, see 2.4 Second Shot of the Rack Push Out), he continues at the table for the next shot. If he legally pockets the nine ball on any shot (except a push out), he wins the rack. If the shooter fails to pocket a ball or fouls, play passes to the other player, and if no foul was committed, the incoming player must play the cue ball from the position left by the other player.