CONCENTRATION By Nugent, Pam M.S. - April 7, 2013 noun. 1. the action of gathering together or concentrating. 2. the amount of a compound dissolved into a liquid or solution. CONCENTRATION: "The concentration of liquids is used frequently in the art of baking." Related Psychology Terms SOLVENT SOLUTE PUNITIVE DAMAGES OXIDATION BENZENE MEDIUM CONTEMPORANEITY OBSERVATION TOXIN PERFORMANCE Cite this page: Nugent, Pam M.S., "CONCENTRATION," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/concentration/ (accessed December 11, 2018).