人偏離大家的中心
這一族把「離中心」用在人身上：中心就是周圍的人習慣怎麼做，偏出去的就叫 eccentricity。
noun · C1
The quality of behaving in a way that is strange or unusual but not harmful: the general habit of doing things differently from everyone around you.
古怪；與眾不同的作風
核心畫面
One way to hold this word is to notice what sits inside it: centre. Eccentricity can then be thought of as a way of measuring how far something sits from the middle. With people, the middle is what everyone around them does, and a person who dresses, works and thinks off to one side of it has eccentricity. With shapes, the middle is a perfect circle, and the further a curve or an orbit is stretched away from that, the higher its eccentricity. With networks, the middle is the point that can reach everything easily, and a point far out at the edge has a high one. Different fields, one picture: not in the centre, and by how much.
這個字裡面看得到 centre（中心），所以 eccentricity 可以想成「離中心有多遠」的一種量法。放在人身…更多收起
這個字裡面看得到 centre（中心），所以 eccentricity 可以想成「離中心有多遠」的一種量法。放在人身上，中心就是周圍的人怎麼過日子；一個人穿著、作息、想法都偏在旁邊，那就是他的 eccentricity。放在形狀上，中心是完美的圓；一條曲線或一條軌道被拉得越長越扁，離心率就越高。放在網路上，中心是那個到哪裡都很近的點；越邊緣的點，數字越大。領域不同，畫面是同一張：不在正中間，而且量得出差多少。From the word’s history
Wiktionary records eccentricity as borrowed from Latin eccentricitas, and analyses the modern word as eccentric plus -ity. The packet does not go further back, so nothing more is claimed here.
Wiktionary 記載 eccentricity 借自拉丁文 eccentricitas，並把現代這個字拆成 eccentric 加 -ity。證據只到這裡，所以更早的來源不在此多作推論。
packet evidence: Wiktionary etymology_text for eccentricity (source_ref kaikki:3f6f69a190036ae4:1148813633:18922)
Two branches
形狀與位置偏離中心
同樣是「離中心多遠」，但這裡量得出一個數字，而且量的是形狀或網路上的位置，不是人的行為。
noun · C1
A number that says how far an oval curve or an orbit is from being a perfect circle. A circle has an eccentricity of 0, and the longer and thinner the shape is, the closer the number comes to 1.
離心率