a belief that can guide behavior; "the architect has a theory that more is less"; "they killed him on the theory that dead men tell no tales"
a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; "theories can incorporate facts and laws and tested hypotheses"; "true in fact and theory"
a courteous act indicating affection; "she tried to win his heart with her many attentions"
a motionless erect stance with arms at the sides and feet together; assumed by military personnel during drill or review; "the troops stood at attention"
the faculty or power of mental concentration; "keeping track of all the details requires your complete attention"
the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others
a general interest that leads people to want to know more; "She was the center of attention"