one-tailed

adjective
\ˈwən-ˈtāl(d) \
variants: or less commonly one-tail \ˈwən-​ˈtāl \

Definition of one-tailed 

: being a statistical test for which the critical region consists of all values of the test statistic greater than a given value or less than a given value but not both — compare two-tailed

First Known Use of one-tailed

1942, in the meaning defined above

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The first known use of one-tailed was in 1942

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