a group or mass of distinct or varied things, persons, etc.: an aggregation of complainants. 2. collection into an unorganized whole. 3. the state of being so collected. 4. Biology, Ecology. a group of organisms of the same or different species living closely together but less integrated than a society.
Not to be confused with Pelvic Diaphragm. In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center.The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture.Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses).he role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses).
The main function of the diaphragm is as a muscle of respiration, meaning that it aids with breathing. It is aided by other muscles and accessory muscles of breathing when a person experiences shortness of breath. When the diaphragm contracts, the lungs expand and air is inhaled.t is a flat sheet of muscle that is responsible for breathing. The diaphragm essentially pulls and pushes against the lung causing it to expand with inhalation and contract with exhalation. The thoracic diaphragm also separates the organs in the thoracic cavity (chest) and abdominal (belly).