"megabyte" in the noun sense
1. megabyte, M, MB
a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes
2. megabyte, mebibyte, M, MB, MiB
a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes
Source: WordNet® (An amazing lexical database of English)
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