Etymology
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megabyte (n.)

"a million bytes," 1972, from mega- + byte.

The Sussex team has run the Forrester/Meadows models more than 1000 times on the UK's most powerful computer (the giant two-megabyte IBM 370/165 at Harwell). ["New Scientist," May 4, 1972]

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Definitions of megabyte

megabyte (n.)
a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes;
Synonyms: m / mb
megabyte (n.)
a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes;
Synonyms: mebibyte / m / mb / MiB
From wordnet.princeton.edu