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Definitions

mainframe

[meyn-freym] / ˈmeɪnˌfreɪm /
NOUN
central processing unit
Synonyms






Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In February, IBM stock posted its worst decline in 25 years—tumbling sharply on news that Anthropic had released AI tools that could help with modernizing Cobol, a programming language mainly run on IBM mainframe computers.

From The Wall Street Journal • Mar. 17, 2026

The analyst said investors might dispute his call, given concern that Anthropic’s Claude Code tool will disrupt IBM’s mainframe business.

From Barron's • Feb. 25, 2026

“The idea of shifting off of mainframe is not a new concept,” Daryanani concluded.

From Barron's • Feb. 24, 2026

But IBM’s z17 mainframe has still proved popular, Daryanani added, with customers seemingly gravitating toward benefits like 100% uptime, quality encryption and cost efficiencies.

From MarketWatch • Feb. 24, 2026

Despite Mother’s “get out of jail free” card, she was still determined to climb the wall and hack into the company’s mainframe.

From "City Spies" by James Ponti