attention

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of close or careful observing or listening.
• noun The ability or power to keep the mind on something; the ability to concentrate.
• noun Notice or observation.
• noun The act of dealing with something or someone; treatment:
• noun Acts of interest or interference.
• noun Acts of consideration or courtesy, especially in an effort to win someone's affection or gain sexual favors.
• noun A military posture, with the body erect, eyes to the front, arms at the sides, and heels together.
• interjection Used as a command to assume an erect military posture.

from The Century Dictionary.

• noun Active direction of the mind upon an object of sense or of thought, giving it relative or absolute prominence: it may be either voluntary or involuntary.
• noun The power or faculty of mental concentration.
• noun Consideration; observant care; notice: as, your letter has just arrived, and will receive early attention.
• noun Civility or courtesy, or an act of civility or courtesy: as, attention to a stranger; in the plural, acts of courtesy indicating regard: as, his attentions to the lady were most marked.
• noun In military tactics, a cautionary word used as a preparative to a command to execute some manœuver: as, attention, company! right face!
• noun The whole of consciousness, regarded as made up of contents which may successively become clear under attention. The first usage is based on the analogy of the visual field of regard, the second on the analogy of the field of vision.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act or state of attending or heeding; the application of the mind to any object of sense, representation, or thought; notice; exclusive or special consideration; earnest consideration, thought, or regard; obedient or affectionate heed; the supposed power or faculty of attending.
• noun An act of civility or courtesy; care for the comfort and pleasure of others.
• noun to be courteous or attentive to; to wait upon as a lover; to court.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable Mental focus.
• noun countable An action or remark expressing concern for or interest in someone or something, especially romantic interest.
• noun uncountable, military A state of alertness in the standing position.
• interjection military Used as a command to bring soldiers to the attention position.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the faculty or power of mental concentration
• noun a motionless erect stance with arms at the sides and feet together; assumed by military personnel during drill or review
• noun a general interest that leads people to want to know more
• noun the work of providing treatment for or attending to someone or something
• noun a courteous act indicating affection
• noun the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others