51�Թ�

the act of concentrating; the state of being concentrated.

exclusive attention to one object; close mental application.

something concentrated.

Military.��

1. the assembling of military or naval forces in a particular area in preparation for further operations.

2. a specified intensity and duration of artillery fire placed on a small area.

the focusing of a student's academic program on advanced study in a specific subject or field.

Chemistry.��(in a solution) a measure of the amount of dissolved substance contained per unit of volume.

Also called memory.��Cards.��a game in which all 52 cards are spread out face down on the table and each player in turn exposes two cards at a time and replaces them face down if they do not constitute a pair, the object being to take the most pairs by remembering the location of the cards previously exposed.