concentration

UK: /ˌkɒns^ənˈtreɪʃ^ən/

US: /ˌkɑnsənˈtreɪʃən/

US: (kon′sən trā′shən)

WordReference Random House Learner's Dictionary of American English © 2026

con•cen•tra•tion /ˌkɑnsənˈtreɪʃən/   n. 

1. [uncountable] the directing of one's efforts to one point:
   will need all her concentration to perform a triple toe jump.
2. the bringing to a single point:
   [uncountable] The party worked for the concentration of power in the hands of the few.
   [countable] large concentrations of immigrants.

WordReference Random House Unabridged Dictionary of American English © 2026

con•cen•tra•tion  (kon′sən trā′shən), n. 

1. the act of concentrating;
   the state of being concentrated.
2. exclusive attention to one object;
   close mental application.
3. something concentrated:
   a concentration of stars.
4. [Mil.]
   • the assembling of military or naval forces in a particular area in preparation for further operations.
   • a specified intensity and duration of artillery fire placed on a small area.
5. the focusing of a student's academic program on advanced study in a specific subject or field.
6. Chemistry (in a solution) a measure of the amount of dissolved substance contained per unit of volume.
7. Also called memory. [Cards.] a game in which all 52 cards are spread out face down on the table and each player in turn exposes two cards at a time and replaces them face down if they do not constitute a pair, the object being to take the most pairs by remembering the location of the cards previously exposed.

• concentr(ic) + -ation 1625–35

Collins Concise English Dictionary © HarperCollins Publishers::

concentration / ˌkɒnsənˈtreɪʃən/ noun

1. intense mental application; complete attention
2. the act or process of concentrating
3. something that is concentrated
4. the strength of a solution, esp the amount of dissolved substance in a given volume of solvent, usually expressed in moles per cubic metre or cubic decimetre (litre)
5. the act of bringing together military forces
6. the application of fire from a number of weapons against a target