(1)双重国籍
指一个人同时具有两个国家的公民身份。

(2)
〈美〉双重公民身份
指出生于美国或归化于美国的人，既是美国的公民，又是其所居住的州的公民，因而拥有双重公民身份。

• sigil
• sigillare
• sigillum
• Sigillum est cera impressa, quia cera sine impressione non est sigillum.
• sigla
• sign
• signa
• signals
• signare
• signatorius annulus
• signatory
• signature
• signature ad referendum
• signature by mark
• signature by proxy
• signature card
• signature loan
• signed
• signed, sealed, and delivered
• signet
• significant contact
• significant-relationship theory
• significavit
• signify
• signing judgment