concentration
con-cen-tra-tion
noun
The ability to direct all your mental effort towards one thing.
"My concentration improved after a good night's sleep."
noun
A large number of people or things gathered closely together.
"There's a concentration of businesses in this area."
noun
The amount of a substance present in a mixture or solution.
"The concentration of sugar in the drink was high."
Thesaurus
Synonyms: assiduity, assiduousness, denseness, density, tightness, compactness, absorption, engrossment, immersion
Antonyms: dilution, dispersion, distribution