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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(31) The drug may affect your powers of concentration.
(32) The slightest sound would break his concentration.
(33) The noise outside made concentration difficult.
(34) He looked at the coded message, frowning in concentration.
(35) He knitted his brow in concentration.
(36) Heart surgery exacts tremendous skill and concentration.
(37) The job demands a high level of concentration.
(38) The phone rang, breaking my concentration.
(39) The job demands intense concentration.
(40) Quin's brow furrowed in concentration.
(41) Latterly, her concentration hasn't been so good.
(42) Lack of concentration was a real problem.
(43) He wrinkled his brow in concentration.
(44) He knitted his brows in concentration.
(45) I lost my concentration and fell asleep.
(46) One momentary lapse in concentration could prove fatal.
(47) Her brow furrowed in concentration.
(48) He paused and narrowed his eyes in concentration.
(49) This concentration of airborne firepower wrought havoc with the enemy forces.
(50) She was listening with such a fury of concentration that she did not notice Arthur had left.
(51) The greatest concentration of traffic is in the city centre.
(52) 'MACRO' is a mnemonic for the five main techniques:Memory, Aims, Concentration,[http://sentencedict.com/concentration.html] Review and Organization.
(53) The prisoners of war were led in to the concentration camp.
(54) We lacked concentration and it cost us the goal and the game.
(55) There was a look of intense concentration on her face.
(56) I found it hard to keep my concentration with such a noise going on.
(57) The concentration of nitrates in the drinking water has risen in recent years.
(58) It's the sort of work that calls for a high level of concentration.
(59) In his concentration on the job in hand, John allowed his normal vigilance to slip.
(60) I found it hard to follow what the teacher was saying, and eventually I lost concentration.
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.