concentration

noun

1. the strength of a solution; number of molecules of a substance in a given volume

   noun.attribute

   Source: WordNet 3.0

2. the spatial property of being crowded together

   noun.attribute

   Synonyms compactness denseness density tightness

   Antonyms dispersion distribution

   Source: WordNet 3.0

3. strengthening the concentration (as of a solute in a mixture) by removing diluting material

   noun.act

   Antonyms dilution

   Source: WordNet 3.0

4. increase in density

   noun.event

   Source: WordNet 3.0

5. complete attention; intense mental effort

   noun.cognition

   Synonyms absorption engrossment immersion

   Source: WordNet 3.0

6. bringing together military forces

   noun.act

   Source: WordNet 3.0

7. great and constant diligence and attention

   noun.attribute

   Synonyms assiduity assiduousness

   Source: WordNet 3.0

8. The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration.

   noun

   Source: webster1913