Definition of "Composition"

I find out the meaning of a composition by seraching from google.com by use the word "composition definition" and then the result as follow:

• a mixture of ingredients
• constitution: the way in which someone or something is composed
• the spatial property resulting from the arrangement of parts in relation to each other and to the whole; "harmonious composition is essential in a serious work of art"
• Musical composition has three meanings in music: * an original piece of music* the musical structure of a musical piece* the process of creating a new piece of music
• In mathematics, a composite function, formed by the composition of one function on another, represents the application of the former to the result of the application of the latter to the argument of the composite. The functions f: X ? Y and g: Y ? Z can be composed by first applying f to an argument x and then applying g to the result. ...
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• Composition is the plan, placement or arrangement of the elements of art in a work. The general goal is to select and place appropriate elements within the work in order to communicate ideas and feelings with the viewer.

The above one is the one that I think it is a composition in photography :) In my opinion I think that the composition is the way to create your picture to be not so boring like to find some important point of your picture and show it to the viewer by using your composition idea.