词典释义：
the fact of being who or what a person or thing is
身份；本体
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he knows the identity of the bombers 他知道投炸弹者的身份
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[mass noun]
she believes she is the victim of mistaken identity .她确信自己是被认错身份的受害者。
the characteristics determining this
（确定身份的）特征
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he wanted to develop a more distinctive Scottish Tory identity .他想具有更为突出的苏格兰保守党人特征。
[as modifier](of an object)serving to establish who the holder, owner, or wearer is by bearing their name and often other details such as a signature or photograph
（物件）能证明持有者身份的
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an identity card .身份证。
a close similarity or affinity
同一性；一致
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the initiative created an identity between the City and the governing elite .这一倡议使伦敦城与执政精英之间达成了一致。
【数】 恒等运算。
(亦作
单位元素，幺元。
【数】 恒等（式）（如（<Italic>x</Italic> + 1）<Superscript>2</Superscript> = <Italic>x</Italic><Superscript>2</Superscript> + 2<Italic>x</Italic> + 1）。
"late 16th cent. （in the sense ‘quality of being identical’）： from late Latin
