one–tailed adjective \ˈwən-ˈtāl(d)\
: 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
Seen & Heard
What made you want to look up one-tailed? Please tell us where you read or heard it (including the quote, if possible).