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Definition of mainframe

mainframe

/ˈmeɪnfreɪm/
Plural:mainframes
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mainframe Lexical Profile

mainframe Game Scores & Validity

• noun

1

A large, high-speed computer system capable of supporting numerous workstations or peripherals simultaneously, used especially by large organizations for bulk data processing and critical applications.

Example

"The bank relies on a central mainframe to process millions of financial transactions securely every day."

2

The central processing unit and primary memory cabinet of a large computer system, as distinct from its peripheral devices.

Example

"Technicians had to replace a faulty circuit board inside the mainframe before the terminal displays could reconnect."

Synonyms
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Antonyms
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• Nearby Words

main river
mainboard
mainer
mainframe
mainland
mainlander
mainline

Word Origin & Etymology

Coined in the 1950s from 'main' and 'frame', originally referring to the large metal cabinet or framework that housed the central processing unit and main memory of early room-sized computers.

Cite this Entry

Wordmom. (2026). Definition of Mainframe. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/mainframe
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