one-tailed

adjective

ˈwən-ˈtāl(d) 

variants or less commonly one-tail

ˈwən-ˈtāl 

: 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

Word History

First Known Use

1942, in the meaning defined above