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1. (geology) A large crater formed by a volcanic explosion or by collapse of the cone of a volcano.

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Latin: a A b B c C d D e E f F g G h H i I j J k K l L m M n N o O p P q Q r R s S t T u U v V w W x X y Y z Z Accented: à-ç è-ý À-Ü Āā-Řř Śś-Žž Greek: Α-Κ Λ-Σ Τ-Ω α-θ ι-ρ σ-ω Ἀἀ-Ῥῥ Cyrillic: А-Н О-Я а-б в-г д-з и-к л-м н-о п р-с т-ц ч-я(-ә) Armenian: Ա-դ ե-ճ մ-ֆ Hebrew: ‏‏א-ו‎ ז-ל‎ מ-צ‎ ק-ת‎ Arabic: ‏‏ا-ب‎ ت-س‎ ش-م‎ ن-ی‎ Devanagari: अ-ठ ड-ॡ Khmer: ក – ឱ Japanese: ぁ-げ こ-ぱ ひ-ケ コ-ヶ Han Characters: 一 促 冱 卙 哪 圱 天 存 崃 弿 愷 捇 新 杁 Korean: ㄱ 가 나 다 라 마 바 사 아 자 차 카 타 파 하

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In most postal systems express mail refers to an accelerated delivery service for which the customer pays a surcharge and receives faster delivery. Express mail is a service for domestic mail and is governed by a country's own postal administration. Since 1998 the international accelerated delivery services are governed by the EMS Cooperative.

Express Mail Service

Express Mail Service (EMS) is an international express postal service offered by postal-administration members of the Universal Postal Union (UPU) which created the EMS Cooperative in 1998 within the framework of the UPU, a specialized agency of the United Nations, to promote the harmonization and development of postal services worldwide. Currently EMS is offered by 153 of the 191 UPU member countries' postal authorities and an integral part of their normal postal services. Seven additional countries have arrangements to deliver EMS items. An independent auditor measures the express delivery performance of all international EMS operators and each member is awarded a Gold, Silver, or Bronze certificate depending on their yearly performance. These countries are recorded in the EMS Cooperative's Hall of Fame.

Express Mail in the United States and Express Mail International

The United States Postal Service (USPS) provides Express Mail for domestic U.S. delivery, and offers two EMS categories of services for Express Mail International. One is simply called Express Mail International and the other service is called Global Express Guaranteed(GXG). These two USPS International Mail terms are often confused with their service called Express Mail, which is a specific classification of mail for domestic accelerated postal delivery within the U.S.