From WordNet (r) 3.0 (2006) :
megabyte
n 1: a unit of information equal to 1000 kilobytes or 10^6
(1,000,000) bytes [syn: megabyte, M, MB]
2: a unit of information equal to 1024 kibibytes or 2^20
(1,048,576) bytes [syn: megabyte, mebibyte, M, MB,
MiB]