Wordnet 3.0
NOUN (1)
1. 
 a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes; 
[syn: megabyte, mebibyte, M, MB, MiB]
WordNet (r) 3.0 (2006):
mebibyte
    n 1: a unit of information equal to 1024 kibibytes or 2^20
         (1,048,576) bytes [syn: megabyte, mebibyte, M, MB,
         MiB]