‘建军’ literally means ‘to build/establish an army’ and functions both as a verb and a noun. The character 建 (jiàn) means ‘to build’, ‘to establish’, or ‘to found’, while 军 (jūn) means ‘army’ or ‘military force’. Together, they refer specifically to the founding of a formal military organization — most commonly the People’s Liberation Army (PLA) on August 1, 1927, an event commemorated annually as ‘Army Day’ (建军节, jiàn jūn jié) in China.

In modern usage, ‘建军’ appears mainly in historical, political, or commemorative contexts — such as official speeches, textbooks, news reports about military anniversaries, or museum exhibits. It is rarely used in everyday conversation outside formal or patriotic settings. As a noun, it often appears in compounds like 建军节 (Army Day) or 建军历史 (history of the PLA’s founding). As a verb, it tends to appear in passive or abstract constructions, e.g., ‘中国人民解放军的建军’ (the founding of the PLA).