noun
underflow
Computing term for a condition where a calculated value is too small to be represented in the available data type, often resulting in zero or a subnormal number.
浮動小数点演算で下位けたあふれが発生すると、結果がゼロになることがある。
When underflow occurs in floating-point arithmetic, the result may become zero.
上位けたあふれ (overflow) is the opposite condition where a value is too large to be represented.
Compound of 下位 (かい, 'lower order') + けた (digit) + あふれ (overflow), literally 'lower-digit overflow', calqued from English 'underflow'.