An exclamation used as a greeting or to get someone's attention; informal and friendly.
A variant spelling and pronunciation of 'hey,' which comes from Old English 'hǽ.' It's one of the oldest attention-getting sounds in English, used since medieval times.
'Hei' and similar interjections like 'hey' are among the most universal human sounds—archaeologists believe they've been ways to call attention for thousands of years across all cultures.
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