The third and last period of a Buddha-kalpa; the first is the first 500 years of correct doctrine, the second is the 1, 000 years of semblance law, or approximation to the doctrine, and the third a myriad years of its decline and end. Also 末代.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

末世 [py] mòshì [wg] mo-shih [ko] 말세 malse [ja] マッセ masse ||| (paścima-kāla). Future generation(s). A latter age (time period). The age of the decline of the dharma 末法. Final age.

[Dictionary References] Naka1283d Iwa758 [Credit] cmuller(entry) cwittern(py)

末世===（術語）澆末之世代也。釋迦入滅後五百年為正法時，次一千年為像法時，後萬年為末法時。末世者，即末法時也。

丁福保《佛學大辭典》