‘共同’ (gòng tóng) is an adjective meaning ‘joint’, ‘shared’, or ‘common’. It combines two characters: 共 (gòng), meaning ‘together’ or ‘in common’, and 同 (tóng), meaning ‘same’ or ‘alike’. Together, they emphasize collective participation or shared identity—often implying cooperation, mutual involvement, or equality in experience or responsibility. It’s frequently used before nouns (e.g., 共同目标, 共同利益) or as a predicate (e.g., 我们共同完成).

This word appears often in formal, written, or cooperative contexts—such as education, workplace collaboration, social policy, or family life—but is less common in casual speech than simpler alternatives like 一起 or 共用. It carries a neutral-to-positive tone and conveys intentionality and alignment, not just coincidence. Unlike English ‘common’, it rarely means ‘ordinary’ or ‘frequent’; its core sense is always relational and participatory.