2.  Psychology .
     a.  a concentration of the mind on a single object or thought, especially one preferentially selected from a complex, with a view to limiting or clarifying receptivity by narrowing the range of stimuli.
     b.  a state of consciousness characterized by such concentration.
     c.  a capacity to maintain selective or sustained concentration.

3.  observant care; consideration: Individual attention is given to each child.

4.  civility or courtesy: attention to a guest.

5.  notice or awareness: His deliberate cough caught the waiter’s attention.

6.  attentions, acts of courtesy or devotion indicating affection, as in courtship.

7.  Military . an erect position with eyes to the front, arms to the sides, and heels together (often used as a command).