early position (EP)
(n phrase) In a poker game, the first few positions to the left of the dealer, or to the left of the obligatory blinds. Compare with late position. Some claim early position, in an eight-handed poker game, is the first three positions.
middle position (MP)
(n phrase) In a poker game, somewhere between early position and late position, generally considered to be those players who would, on the first round of betting, act fourth, fifth, or sixth.
late position (LP)
(n phrase) In a poker game, positions to the right of the dealer, that is, those that make their decisions after the first few players have acted. Late position is advantageous, because players get to see what the other players have done before they have to act, that is, they have more information than those who act before they do. Some claim late position, in an eight-handed poker game, is the last three positions. Compare with early position. Sometimes called back seat.
semibluff
(n) A bet made on a hand that is probably not the best at the time of the bet, but that has a possibility of improving to the best (has one or more outs). If the bet gets everyone else to fold, it succeeds as a bluff; if it does not, the hand might still improve (in draw) on the draw or (in stud and hold 'em) on succeeding cards. This term was first popularized in the writings of noted poker author and theorist David Sklansky. Compare with complete bluff.
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Don't know what antibluffing is.