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A Condition which, if true, guarantees that a result is also true. (However, the result may also be true if the Condition is not met.) If a Condition is both Necessary and Sufficient, then the result is said to be true Iff (``if and only if'') the Condition holds.
For example, the condition that a decimal number 
end in the Digit 2 is a sufficient but not Necessary
condition that be Even.
See also Iff, Implies, Necessary