外界
wàijiè · HSK 5
the outside world
🌍 外 (outside) + 界 (boundary/realm) = the realm outside
外 means outside or external; 界 means boundary, realm, or world (as in 世界). Together: the realm beyond one's own — the external world.
外 — evening 夕 + divination 卜
Originally a compound of 夕 (evening) and 卜 (divination). Ancient Chinese divinations were performed in the morning; doing them at evening (夕) was considered irregular or 'outside' the norm. From this sense of deviation, 外 came to mean 'outside' or 'external'.
界 — field 田 + scope 介
界 combines 田 (field) as the semantic component with 介 (jiè) as the phonetic. The original sense referred to boundaries between fields, then broadened to any border, limit, or realm — yielding modern meanings like 'world' (世界) and 'boundary' (边界).