concentration Synonyms

absorption density immersion assiduity assiduousness compactness clustering denseness tightness cluster gathering strength preoccupation diligence intensity engrossment focus intentness centralization attention single-mindedness application persistence nucleolus niggardness pondering pooling pooler poignancy centralization of power sedulity saturation rumination reduction ratio introspection close attention preoccupancy potency narrowing musing loadstar load level isthmus involvement interpenetration intentiveness loudness lucubration