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- The property of a material that changes acoustic energy into (usually) heat energy. A material or surface that absorbs sound waves does not reflect them. Absorption of a given material is frequency dependent as well as being affected by the size, shape, location, and mounting method used. Source: Church Audio & Acoustics Glossary
- In acoustics, the changing of sound energy to heat. Source: http://www.owenscorning.com/around/sound/glossary.asp
- The opposite of reflection. Sound absorption results from the conversion of sound energy into another form, usually heat or motion, when passing through an acoustical medium. When a sound wave encounters resistance, absorption occurs. Absorption is measured in sabins (after Wallace Clement Sabine). One sabin is the amount of absorption offered by one square foot of open air. 
- (biology) the taking up of substances or their passage through the walls of cells Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- (biotechnology) The process of absorbing; specifically:
- In physiology, it refers to the movement of liquids and solutes into cells by way of diffusion or osmosis.
- In chemistry, it refers to the drawing of a gas or liquid into the pores of a permeable solid.
- In immunology, it refers to a process in which an antigen or antibody is used to pull an analogous antigen or antibody out of a solution.
- (environment) The uptake of water, other fluids, or dissolved chemicals by a cell or an organism (as tree roots absorb dissolved nutrients in soil.) Source: Terms of the Environment
- The phenomenon observed when a pleochroic mineral is rotated in plane polarized light. In certain positions, the mineral is darker than in others, owing to the absorption of light.
- In hydrology, a term applied to the entrance of surface water into the lithosphere by all methods. AGI
- The reduction of light intensity in transmission through an absorbing substance or in reflection from a surface. In crystals, the absorption may vary with the wavelength and with the electric vector of the transmitted light with respect to crystallographic directions.
- Any mechanism by which energy, e.g., electromagnetic or seismic, is converted into heat.
- Taking up, assimilation, or incorporation, e.g., of liquids in solids or of gases in liquids. CF: adsorption
- The entrance of surface water into the lithosphere by any method.
Source: Dictionary of Mining, Mineral, and Related Terms
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