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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(1) This thesis will need all your concentration.
(2) Total concentration is required with no distractions.
(3) Neal kept interrupting, breaking my concentration.
(4) The game requires great concentration.
(5) He has a short attention/concentration span.
(6) They liberated all war prisoners from the concentration camp.
(7) This test will need all your concentration.
(8) This book requires a great deal of concentration.
(9) Stress and tiredness affect your powers of concentration.
(10) He set about the task with grim concentration.
(11) The high concentration of sugars forms a syrup when the sap evaporates.
(12) She needed all her powers of concentration to stop herself from slipping on the icy road.
(13) The Auschwitz concentration camp always remind the world of the holocaust.
(14) She frowned with concentration.
(15) I'm afraid my concentration began to waver as lunch approached.
(16) Chess requires a very high level of concentration.
(17) I find that yoga improves my powers of concentration.
(18) Skiing at 80 miles per hour requires total concentration. Sentencedict.com
(19) Don's voice from outside broke my concentration.
(20) The drug affects one's power of concentration.
(21) The tennis players need total concentration during play.
(22) Carter wrinkled his forehead in concentration.
(23) What is the concentration of salt in sea water?
(24) With great concentration she went through the movements.
(25) A single lapse of concentration cost Sampras the game.
(26) His concentration lapsed after a few minutes.
(27) His face was a study in concentration.
(28) She was possessed of exceptional powers of concentration.
(29) He kept his eyes on the road ahead, his face taut with concentration.
(30) Stress and tiredness often result in a lack of 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.