Irrelevant or unrelated to the subject being dealt with; coming from outside and not belonging. Describes information, details, or elements that are not essential to the main point.
From Latin 'extraneus' meaning 'external' or 'foreign', from 'extra' (outside). The word has maintained its core meaning of something that comes from outside the relevant boundaries.
Think 'extra-neous' - it's the EXTRA stuff that's not necessary! Like extra toppings on a pizza that don't belong, extraneous details are the extras you don't need.
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