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Mathematica® Teacher's Edition (2002)

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Chop

FilledSmallSquare Chop[expr] replaces approximate real numbers in expr that are close to zero by the exact integer 0.

FilledSmallSquare Chop[expr, delta] replaces numbers smaller in absolute magnitude than delta by 0.
FilledSmallSquare Chop uses a default tolerance of .
FilledSmallSquare Chop works on both Real and Complex numbers.
FilledSmallSquare See The Mathematica Book on the web: Section 3.1.4.
FilledSmallSquare See also: Rationalize, Round.