An entity is something that exists separately from other things and has a clear identity of its own.
例句
...the earth as a living entity...作為一個有生命的實體的地球North and South will remain separate entities within a commonwealth until the year 2000.南方和北方將作為一個政治聯合體下的兩個獨立實體繼續存在，直至2000年。
英漢詞典釋義
n.
實體, 獨立存在體, 實際存在物.統一性
The country is no longer one political entity.這個國家不再是一個統一的政治實體了。
英英詞典釋義
Noun
1. that which is perceived or known or inferred to have its own distinct existence (living or nonliving)