(ATM, or "fast packet") A method for the dynamic allocation of bandwidth using a fixed-size packet (called a cell). See also ATM Forum, Wideband ATM. {ATM acronyms (http://www.atmforum.com/atmforum/acronym_index.html)}. {Indiana acronyms (http://cell-relay.indiana.edu/cell-relay/FAQ/ATM-Acronyms.html)}. [More detail? Data rate(s)?] (1996-04-01)