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Definition of buffer
1a person or thing that prevents incompatible or antagonistic people or things from coming into contact with or harming each other:family and friends can provide a buffer against stress 2 (also buffer solution) Chemistry a solution that resists changes in pH when acid or alkali is added to it. Buffers typically involve a weak acid or alkali together with one of its salts. 3 Computing a temporary memory area in which data is stored while it is being processed or transferred, especially one used while streaming video or downloading audio.
verb [with object]
1lessen or moderate the impact of (something):the massage helped to buffer the strain 2treat with a chemical buffer:add organic matter to buffer the resulting alkalinity 3 Computing store (data) in a buffer while it is being processed or transferred:try buffering as much of the video stream as you can before you hit the ‘play’ button