identity

identity (n.)

etymology

[ad. F. identité (Oresme, 14th c.), ad. late L. identits (Martianus Capella, c425), peculiarly formed from ident(i)-, for L. idem ‘same’ + -tas, -tatem

definitions

1. The quality or condition of being the same in substance, composition, nature, properties, or in particular qualities under consideration; absolute or essential sameness; oneness.

2. a. The sameness of a person or thing at all times or in all circumstances; the condition or fact that a person or thing is itself and not something else; individuality, personality. 

3. ‘The self-same thing.’ Obs. rare.

4. Alg.   
a. The equality of two expressions for all values of the literal quantities: distinctively denoted by the sign .    b. An equation expressing identity, an identical equation (IDENTICAL 4a).

5. The condition of being identified in feeling, interest, etc. rare.

6. Logic. Law or Principle of Identity, the principle expressed in the identical proposition A is A. Also attrib., as identity formula, relation, sentence.

7. (old) identity: a person long resident or well known in a place. N.Z. and Austral.

8. Math.    a. An element of a set which, if combined with any element by a (specified) binary operation, leaves the latter element unchanged.

定義

【名】
1.〔人やものの〕正体｛しょうたい｝、身元｛みもと｝◆その人が誰で、そのものが何であるかということを表す性質や条件。
2.〔ある人やものが持つ他と異なる〕独自性｛どくじ せい｝、固有性｛こゆう せい｝、アイデンティティー
3.《心理学》自我同一性｛じが どういつせい｝
4.同一性｛どういつ せい｝◆どのような状況にあっても、ほかのものと同一であるという事実や、同一であるための条件。
5.《数学》恒等（式）｛こうとう（しき）｝
6.《数学》単位元｛たんいげん｝◆【同】identity element

例文

1. Your identity is safe with me.
あなたの正体のことならもう心配しなくても良いのです。
2. She’s desperately trying to discover her identity
彼女は必死に自分の在りかを探している。
3. His identity was cunningly stolen
彼の（ｘとしての）身元はかしこく窃盗された。
4. I think I’ve lost my identity
私はもはや自分らしさを失くしたようです。