band·width 
/ˈbændˌwɪdθ/ noun
plural band·widths /ˈbændˌwɪdθ/ noun technical : a measurement of the ability of an electronic communications device or system (such as a computer network) to send and receive information [count] ▪ The modem has a bandwidth of 56 kilobits per second. [noncount] ▪ Graphics use more bandwidth than text does.
