Underflow definitions

ŭn'dər-flō'
A data-processing error arising when the absolute value of a computed quantity is smaller than the limits of precision of the computing device, retaining at least one significant digit.
noun
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(1) An error condition that occurs when the result of a computation is smaller than the smallest quantity the computer can store.
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(computing) A condition in which the value of a computed quantity is smaller than the smallest non-zero value that can be physically stored; usually treated as an error condition.
noun
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(computing) The error condition that results from an attempt to retrieve an item from an empty stack.
noun
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(computing) To trigger the condition in which the value of a computed quantity is smaller than the smallest non-zero value that can be physically stored.
verb
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Origin of underflow

under- +"Ž flow, modelled on overflow.