Top summer travel destinations on any three-letter combination, particularly a nonsense syllable. trimming n. the exclusion of a fixed percentage of cases at each end of a distribution before calculating a statistic on the batch of data. This is done to eliminate the influence of extreme scores on the estimate. triple blind see blind. trochlear nerve the fourth cranial nerve, which contains motor fibers supplying the superior oblique muscle of the eyeball. truncated distribution a set of scores lacking values beyond a specific maximum point, below a specific minimum point, or both. Top summer travel destinations 2016.