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concentrating; the process of becoming concentrated, or the state of being concentrated; concentration. Concentration of the lunar beams. Boyle. Intense concetration of thought. Sir J. Herschel.

Act of deconcentrating. [R.]

The act of reconcentrating or the state of being reconcentrated; esp., the act or policy of concentrating the rural population in or about towns and villages for convenience in political or military administration, as in Cuba during the revolution of 1895-98.

Hypnotism of one's self by concentration of the attention on some object or idea.

A principal or important point of concentration; the nucleus around which things are gathered or to which they tend; an object of attention, action, or force; as, a center of attaction.

Serving or tending to concentrate; characterized by concentration. A discrimination is only possible by a concentrative act, or act of attention. Sir W. Hamilton.

A rearrangement or concentration of the different constituents of one or more substances into a distinct and definite compound of greater complexity and molecular weight, often resulting in an increase of density, as the condensation of oxygen into ozone, or of acetone into mesitylene. Condensation product (Chem.), a s…

A peculiar phase of the aurora borealis, formed by the concentration or convergence of luminous beams around the point in the heavens indicated by the direction of the dipping needle.

A conjunction or concentration of rays in one point. Bacom

To have courage for; to attempt courageously; to venture to do or to undertake. What high concentration of steady feeling makes men dare every thing and do anything Bagehot. To wrest it from barbarism, to dare its solitudes. The Century.

To prevent from centralizing; to cause to withdraw from the center or place of concentration; to divide and distribute (what has been united or concentrated); -- esp. said of authority, or the administration of public affairs.

To withdraw from concentration; to decentralize. [R.]

ing water from spirits and acids, by evaporation or repeated distillation; -- called also concentration, especially when acids are the subject of it. [Obs.]

A central point; a point of concentration. Aplanatic focus. (Opt.) See under Aplanatic. -- Conjugate focus (Opt.), the focus for rays which have a sensible divergence, as from a near object; -- so called because the positions of the object and its image are interchangeable. -- Focus tube (Phys.), a vacuum tube for Ro…

To bring to a certain strength or grade of concentration; as, to gradate a saline solution.

les, currants, etc. It is levorotatory or dextrorotatory according to the temperature and concentration. An artificial variety is a derivative of succinic acid, but has no action on polarized light, and thus malic acid is a remarkable case of physical isomerism.

Derangement of the mind in regard of a single subject only; also, such a concentration of interest upon one particular subject or train of ideas to show mental derangement.

The act or practice of collecting or concentrating the mind; concentration; self-control. [Archaic] From such an education Charles contracted habits of gravity and recollection. Robertson.

A giddy or thoughtless person; one incapable of concentration or attention. [Written also scatter-brains.]

Concentration of one's interests on one's self; self-love; selfishness. Emerson.