The noun 董事长 (dǒngshìzhǎng) means 'chairman of the board' or 'board chairperson.' It is composed of 董事 (director/board member) and 长 (chief/head). It refers to the highest-ranking officer of a corporate board and is commonly used in business and corporate contexts.
董事长明天会出席公司年会。
Dǒngshìzhǎng míngtiān huì chūxí gōngsī niánhuì.
The chairman of the board will attend the company's annual meeting tomorrow.
她三十五岁就当上了董事长。
Tā sānshíwǔ suì jiù dāng shàng le dǒngshìzhǎng.
She became the chairman of the board at just thirty-five.
新任董事长决定调整公司的发展方向。
Xīnrèn dǒngshìzhǎng juédìng tiáozhěng gōngsī de fāzhǎn fāngxiàng.
The new chairman of the board decided to adjust the company's development direction.