Function: noun
Date: 1946
: something added on: as a : a sum or amount added on b : something (as an accessory or added feature) that enhances the thing it is added to <computer hardware add-on s >
Function: noun
Date: 1946
: something added on: as a : a sum or amount added on b : something (as an accessory or added feature) that enhances the thing it is added to <computer hardware add-on s >
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012