A variant spelling or transliteration; can refer to the letter F or in some contexts a type of unit or measurement (though less common in modern English).
This word has multiple origins depending on context—it can be a name transliteration from Chinese, or a letter name. Its usage is highly specialized and context-dependent.
Fei is interesting because it shows how English borrows and adapts words from other languages—especially from Chinese, where it can mean 'non' or 'flying' depending on the tone.
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