Alli is one of the few over-the-counter diet aids that might actually work, according to the Mayo Clinic. The pill is a lower-dosage version of Xenical, consisting of 60 mg of the fat-blocking drug orlistat.
Adjective[edit] tentative â(comparative more tentative, superlative most tentative) Of or pertaining to a trial or trials; essaying; experimental.
Definition of preliminary for English Language Learners. : 1  something that comes first in order to prepare for or introduce the main part of something else. : 2  a game that is played before the main part of a competition to decide which players or teams will be allowed to continue playing.