信函 (xìnhán) · letter, correspondence

Measure Word

一封信函 fēng

HSK 4

我收到了一封正式信函。

Wǒ shōudào le yī fēng zhèngshì xìnhán.

I received a formal letter.

HSK 5

请将申请材料以信函形式寄到本公司。

Qǐng jiāng shēnqǐng cáiliào yǐ xìnhán xíngshì jì dào běn gōngsī.

Please send your application materials to our company by letter.

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More formal than the everyday 信 (xìn). 信函 is the term you'll see in business, legal, and government writing. For casual 'I got a letter,' just say 信.

信 xìn

函 hán