decimal fraction
noun
: a fraction (such as .25 = ²⁵/₁₀₀ or .025 = ²⁵/₁₀₀₀) or mixed number (such as 3.025 = 3²⁵/₁₀₀₀) in which the denominator is a power of 10 usually expressed by use of the decimal point
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Merriam-Webster unabridged
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