singleton

singleton
noun
  1. a single person or thing of the kind under consideration
    单独的人（或物体）
    splitting the clumps of plants into singletons.
    将一丛植物单个分开。
    ■[often as modifier]a child or animal born singly, rather than one of a multiple birth
    单生子女；单生幼畜
    singleton boys.
    单生子。
    ■a person who is not married or in a long-term relationship
    单身的人；无长期亲属关系的人
    ■(in card games, especially bridge) a card that is the only one of its suit in a hand
    （扑克牌，尤指桥牌）单张（一手牌中惟一的某花色的牌）
    ■(Mathematics & Logic)a set which contains exactly one element
    (数，逻)单元素集
语源
  1. late 19th cent.: from single, on the pattern of simpleton
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