Noun

• S: (n) concentration (the strength of a solution; number of molecules of a substance in a given volume)
• S: (n) concentration, density, denseness, tightness, compactness (the spatial property of being crowded together)
• S: (n) concentration (strengthening the concentration (as of a solute in a mixture) by removing diluting material)
• S: (n) concentration (increase in density)
• S: (n) concentration, engrossment, absorption, immersion (complete attention; intense mental effort)
• S: (n) concentration (bringing together military forces)
• S: (n) assiduity, assiduousness, concentration (great and constant diligence and attention)
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• W: (adj) assiduous [Related to: assiduity, assiduousness] (marked by care and persistent effort) "her assiduous attempts to learn French"; "assiduous research"; "sedulous pursuit of legal and moral principles"
• W: (v) concentrate [Related to: concentration] (direct one's attention on something) "Please focus on your studies and not on your hobbies"