apostille (plural apostilles)
- A special sign established in 1961 for certifying foreign documents.
- Under the Hague Convention, signatory countries have agreed to recognize public documents issued by other signatory countries if those public documents are authenticated by the attachment of an internationally recognized form of authentication known as an "apostille." The apostille ensures that public documents issued in one signatory country will be recognized as valid in another signatory country. 
a special sign
- To authenticate an official document in accordance with the Apostille Convention.
2003, Carrie Ostrea, Family Bound: One Couple's Journey Through Infertility and Adoption, page 95:
- We also sent off three copies of our marriage certificates to the State of Nevada to be “apostilled".
2004, Samoa: Assessment of the Supervision and Regulation of the Financial Sector, page 19:
- The fact that Samoa has full diplomatic relations with the People's Republic of China and has a Chinese Embassy is particularly helpful when legalizing or apostilling documents required for transactions and business in mainland China.
- Formal second-person singular (usted) imperative form of apostillar.
- First-person singular (yo) present subjunctive form of apostillar.
- Formal second-person singular (usted) present subjunctive form of apostillar.
- Third-person singular (él, ella, also used with usted?) present subjunctive form of apostillar.