Antonym: distraction. Similar words: concentrating, concentrate, conception, frustration, demonstration, administration, consideration, central. Meaning: [‚kɒnsən'treɪʃn] 
n. 1. (chemistry) the strength of a solution; number of molecules of a substance in a given volume (expressed as moles/cubic meter) 2. the spatial property of being crowded together 3. strengthening the amount of a substance in a unit amount of another substance (as of a solute in a mixture) by removing the other substance 4. increase in density 5. complete attention; intense mental effort 6. bringing together military forces 7. great and constant diligence and attention.
n. 1. (chemistry) the strength of a solution; number of molecules of a substance in a given volume (expressed as moles/cubic meter) 2. the spatial property of being crowded together 3. strengthening the amount of a substance in a unit amount of another substance (as of a solute in a mixture) by removing the other substance 4. increase in density 5. complete attention; intense mental effort 6. bringing together military forces 7. great and constant diligence and attention. 
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(61) It helps my concentration if I listen to music while I'm working.
(62) The government's concentration on tax reduction has won them a lot of support.
(63) She has great powers of concentration for a child her age.
(64) Eileen was deep in concentration, and the sudden appearance of her daughter startled her.
(65) This is a very difficult piece of music to play - it demands a lot of concentration.
(66) There is a heavy concentration of troops in the area.
(67) I had a little lapse of concentration in the middle of the race.
(68) A gas in solution diffuses from a region of greater to one of less concentration.
(69) This is a novel depicting the bitter sufferings of the inmates in a Nazi concentration camp.
(70) Even a low level of noise interferes with my concentration.
(71) Chess is a game that calls into play all your powers of concentration.
(72) People starved of sleep start to lose their concentration and may hallucinate.
(73) pH is a measure of the concentration of free hydrogen atoms in a solution.
(74) Chess is a game that calls into play all one's powers of concentration.
(75) It takes a fair amount of concentration to follow the film's labyrinthine plot.
(76) His ability to absorb information was astonishing, but his concentration span was short.
(77) Hyperactive children often have poor concentration and require very little sleep.
(78) Millions of Jewish people were exterminated in concentration camps in the Second World War.
(79) You cannot afford to relax your concentration for a moment.
(80) Alcohol affects drivers' concentration.
(81) There's been too much concentration of power in the hands of central authorities.
(82) This concentration of airborne firepower played havoc with the enemy forces.
(83) A gas in solution diffuses from region of greater to one of less concentration.
(84) The appropriate concentration of the drug is best determined by experiment.
(85) At least seven died in concentration camps,[www.Sentencedict.com] Williams says.
(86) Even some medical people from the concentration camps.
(87) It's not like a concentration camp.
(88) To join or be sent to a concentration camp.
(89) Laminin concentration is also related to alcohol intake.
(90) Meanwhile, the concentration of ownership has continued apace.
More similar words: concentrating, concentrate, conception, frustration, demonstration, administration, consideration, central, entrance, operation, contribution, migration, reparation, separation, AND operation, immigration, exploration, integration, celebration, corporation, translation, generation gap, collaboration, transformation, convention, conservation, conversation, transportation, orientation, confrontation.