Etymology

Cupertino effect

Today it means: The replacement, by a spell checker, of words that are real (such as proper nouns or alternate spellings), but missing from its internal dictionary, with words that are starkly incorrect in context. Full definition →

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The story

Named for the fact that some older computer spellcheckers did not include the form cooperation and would automatically replace it not with co-operation, but with Cupertino, a name of a city in northern California and headquarters of Apple Inc.

Etymology from Wiktionary, CC BY-SA 4.0.