Archaic literary term for Western countries, especially Europe and America, used in Meiji and Taishō era texts. In modern Japanese, 西洋 or 欧米 are standard.
The word 'taisei' often appears in books from the Meiji period.
famous Western painting; masterpiece of Western painting
From Chinese 泰西 (tàixī), literally 'the far west', used in East Asian classical texts to refer to Western nations. Adopted into Japanese with the same meaning.