two-tailed

adjective
\ˈtü-ˈtāl(d) \
variants: or less commonly two-tail \ˈtü-ˈtāl \

Definition of two-tailed 

: being a statistical test for which the critical region consists of all values of the test statistic greater than a given value plus the values less than another given value — compare one-tailed

First Known Use of two-tailed

1945, in the meaning defined above

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The first known use of two-tailed was in 1945

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