Definition of t distribution
: a probability density function that is used especially in testing hypotheses concerning means of normal distributions whose standard deviations are unknown and that is the distribution of a random variable {latex}t = \frac{u\sqrt{n}}{v}{/latex} where u and v are themselves independent random variables and u has a normal distribution with mean 0 and a standard deviation of 1 and v^{2} has a chisquare distribution with n degrees of freedom
— called also student's t distribution
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MerriamWebster unabridged
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Time Traveler for t distribution
The first known use of t distribution was circa 1957
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