Concentration is defined as close mental attention to something.(noun)
An example of concentration is a student focusing all of her after school time on a specific research paper.
The definition of concentration means the amount of ingredients or parts in relation to the other ingredients or parts.(noun)
An example of concentration is the amount of salt to water in a saltwater solution.
See concentration in Webster's New World College Dictionary
Origin: ML concentratio
See concentration in American Heritage Dictionary 4
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