a yellow-white, more or less viscid substance produced by suppuration and found in abscesses, sores, etc., consisting of a liquid plasma in which white blood cells are suspended. Origin of pus. Latin.
Definition of task. 1  1a : a usually assigned piece of work often to be finished within a certain timeb : something hard or unpleasant that has to be donec : duty, function. 2  2 : subjection to adverse criticism : reprimand âused in the expressions to take, call, or bring to task.
Who has never heard or said: It's so hard to concentrate! or You're not paying enough attention!. Attention is a complex cognitive function which is essential for human behavior. Attention is a selection process for an external (sound, image, smell...) or internal (thoughts) event which has to be maintained at a certain level of awareness. It is not a stable but rather a fluctuating skill. It isn't continuously sustained and is often unconsciously let up on during a task.