1. the action or power of focusing all attention or effort on something
2. a high proportion or density of something in a particular area or substance
3. the amount of a substance dissolved or present in a solution or mixture, typically expressed as a ratio
Usage: chemistry; science

Examples

• The student's concentration on the exam helped her score well.
• High concentrations of salt were found in the water sample.
• The city has large concentrations of immigrants in certain neighborhoods.
• The chemist measured the concentration of acid in the solution.
• Concentrations of pollutants were highest near the factory.
• With better concentration, you can improve your test scores.
• The drug's concentration in the bloodstream peaked after two hours.