1. not directly related to or connected with something; irrelevant
2. coming from outside; external
Usage: formal

Examples

• Please remove any extraneous details from your essay.
• The report contained extraneous information that confused readers.
• Try to focus on the main point and avoid extraneous comments.
• The scientist controlled for extraneous variables in the experiment.
• Extraneous noise from the construction site disrupted the meeting.
• The editor cut out extraneous paragraphs to improve the article’s flow.