megabyte

[ meg-uh-bahyt ]

noun

, Computers.

1. 2 20 (1,048,576) bytes.
2. (loosely) one million bytes. : MB

megabyte

/ ˈmɛɡəˌbaɪt /

noun

1. computing 2 ²⁰or 1 048 576 bytes AbbreviationMBmbyte See also mega-

megabyte

/ mĕg′ə-bīt′ /

1. A unit of computer memory or data storage capacity equal to 1,048,576 bytes (1,024 kilobytes or 2 ²⁰ bytes).
2. One million bytes.

megabyte

1. A unit of computer information: one million bytes .

Word History and Origins

Origin of megabyte¹

First recorded in 1965–70; mega- + byte

Usage

In computer science and industry usage, the prefix mega– often does not have its standard scientific meaning of 1,000,000, but refers instead to the power of two closest to 1,000,000, which is 2 ²⁰, or 1,048,576. The calculation of data storage capacity (measured in bytes) is based on powers of two because of the binary nature of bits (1 byte is 8, or 2 ³, bits). Thus, a megabyte is 1,048,576 bytes, although it is also used less technically to refer to a million bytes. Other numerical prefixes are interpreted similarly. With data transmission rates (measured in bits per second), a bit is considered as a signal pulse, and calculations are generally based on powers of ten. Thus, a rate of one megabit per second is equal to one million bits per second. However, in certain technical contexts, megabit can also refer to 1,048,576 bits. Similarly, the prefix kilo– refers to 1,000 or 2 ¹⁰ (1,024); giga– to 1,000,000,000 (one billion) or 2 ³⁰ (1,073,741,824); and tera– to 1,000,000,000,000 (one trillion) or 2 ⁴⁰ (1,099,511,627,776).

Example Sentences

As the megabytes expended proved, you can make a compelling case for all and absolutely no guarantees about what follows.

From BBC

If you have photos to include with your response, please make sure they are larger than 1 megabyte in size and email them to [e-mail].

From Seattle Times

A 48-megapixel file allows for photos with good detail even with significant cropping, but the file size of each photo can be 75 megabytes or larger.

From New York Times

The government adopted a new tax imposing levies on every phone call, text message and megabyte of data in March.

From Reuters

With data pixels so small, this amounted to quadrillions of megabytes per square centimeter — a stupendous amount of information, but not an infinite amount.

From New York Times