Definition of megabyte in US English:


(also Mb, MB)


  • A unit of information equal to 2²⁰ bytes or, loosely, one million bytes.

    • ‘The software requires only five megabytes of hard disk space and 16 megabytes of random access memory (Ram).’
    • ‘We used to measure data in terms of kilobytes and megabytes; now gigabytes and terabytes are the terms commonly discussed.’
    • ‘Here is a quick explanation of bytes, megabytes, and so on, and some estimates of the storage requirements of various sorts of information.’
    • ‘The Editor's Internet service provider will not process files larger than two megabytes.’
    • ‘I've been writing for years about how the price of hard drives has tumbled down to a penny a megabyte and here I was paying almost 20 cents a megabyte!’