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From The Collaborative International Dictionary of English v.0.48:
concentrated \concentrated\ adj. 1. Having a high density of (the indicated substance); as, a narrow thread of concentrated ore. Note: [Narrower terms: undiluted (vs. diluted)] [WordNet 1.5] 2. Gathered together or made less diffuse; as, their concentrated efforts; his concentrated attention. Opposite of distributed or diffused. Note: [Narrower terms: bunched, bunchy, clustered; centered, centred, centralized, focused; undivided] [Also See: compact.] [WordNet 1.5] 3. Intense; in an extreme degree; -- of mental phenomena; as, her concentrated passion held them at bay. [WordNet 1.5] 4. being the most concentrated solution possible at a given temperature; unable to dissolve still more of a substance. Opposite of dilute or unsaturated. Note: [Narrower terms: supersaturated] Syn: saturated. [WordNet 1.5] 5. reduced to a stronger or more concentrated form; as, concentrated sulfuric acid. Opposite of diluted. Syn: condensed. [WordNet 1.5] 6. characterized by intensity; especially when imposed from without; -- of actions; as, concentrated study. Syn: intensive. [WordNet 1.5] 7. characterized by mental concentration. Syn: intent. [WordNet 1.5 +PJC]