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The Collaborative International Dictionary of English v.0.48 (gcide)

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]