Buffer

Agent noun from obsolete verb buff ("make a dull sound when struck")(mid-16c.), from Old French buffe ("blow").

Full definition of buffer

(plural buffers)

Someone or something that buffs.
(chemistry) A solution used to stabilize the pH (acidity) of a liquid.
(computing) A portion of memory set aside to store data, often before it is sent to an external device or as it is received from an external device.
(mechanical) Anything used to maintain slack or isolate different objects.
(telecommunications) A routine or storage medium used to compensate for a difference in rate of flow of data, or time of occurrence of events, when transferring data from one device to another.
(rail) A device on trains and carriages designed to cushion the impact between them.
(rail) The metal barrier to help prevent trains from running off the end of the track.
An isolating circuit, often an amplifier, used to minimize the influence of a driven circuit on the driving circuit.
(politics, international relations) A buffer zone (such as a demilitarized zone) or a buffer state.
(colloquial) A good-humoured, slow-witted fellow, usually an elderly man.

1864-1865, Charles Dickens, Our Mutual Friend Chapter Book The First, chapter 2 "The Man from Somewhere", Lastly, the looking-glass reflects Boots and Brewer, and two other stuffed Buffers interposed between the rest of the company and possible accidents.
1864-1865, Charles Dickens, Our Mutual Friend Chapter Book The First, chapter 10 "A Marriage Contract", Here, too, are Boots and Brewer, and the two other Buffers; each Buffer with a flower in his button-hole, his hair curled, and his gloves buttoned on tight, apparently come prepared, if anything had happened to the bridegroom, to be married instantly.

2011, November 10, Jeremy Wilson, England Under 21 5 Iceland Under 21 0: match report, An utterly emphatic 5-0 victory was ultimately capped by two wonder strikes in the last two minutes from Aston Villa midfielder Gary Gardner. Before that, England had utterly dominated to take another purposeful stride towards the 2013 European Championship in Israel. They have already established a five-point buffer at the top of Group Eight.

To use a buffer or buffers; to isolate or minimize the effects of one thing on another.
(computing) To store data in memory temporarily.

buffer