concentration
noun
con·cen·tra·tion
| \ ˌkän(t)-sən-ˈtrā-shən
, -ˌsen-\
, -ˌsen-\
Definition of concentration
1a
: the act or process of concentrating : the state of being concentrated
especially
: direction of attention to a single object
All that noise is disturbing my concentration.
b
: an academic major or area of focus within a major
The student chose law as his concentration.
2
: a concentrated mass or thing
a concentration of wealth in the merchant class
3
: the amount of a component in a given area or volume
The ozone concentration in the lower stratosphere has declined.