Mint = As new.
Near mint = Almost like new with one or two very minor flaws.
Excellent = Minor wear yet looks attractive and is perfectly usable .
Very Good = Some wear and tear but overall presentable and usable.
Good = Apparent wear and tear but with obvious deterioration of the condition.
Poor = Extremely worn.
A plus or minus after the grading indicates that the condition is marginally higher or lower than the stated grade