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Definition of Ach

Ach is a word that is used in various contexts and has different meanings. Below are some of the most common definitions:

ACH is the acronym for “Automated Clearing House” in English, which refers to an electronic payment processing system. Through ACH, bank transfers and online payments can be made automatically and securely. This system is used in the United States for direct bank transfers, bill payments, direct salary deposits, and other financial transactions.

Interjection used to express surprise, amazement, or admiration. For example, “Ach! What a beautiful landscape”.

Suffix used to form nouns that indicate action or the result of an action. For example, “wisdom” is the result of the action of “knowing,” while “cruelty” is the result of the action of “being cruel.”

Word used in some Latin American countries, such as Colombia and Ecuador, to refer to a friend or companion. For example, “Juan is my ach.”

Abbreviation for “Auschwitz concentration camp,” the Nazi concentration camp located in Poland during World War II.


As an interjection, ach can be replaced by other words or expressions that denote amazement or surprise, such as “wow!”, “incredible!” or “how amazing!”.


The acronym ACH comes from the English term “Automated Clearing House,” which refers to an electronic payment processing system developed in the 1970s by the US Federal Reserve to facilitate nationwide financial transactions.

The origin of the interjection ach is not entirely clear. Some linguists believe that it may be a variant of other interjections such as “ah” or “oh.” In Latin America, the word ach as a synonym for friend or companion has its origin in indigenous languages such as Quechua or Kichwa, where “achka” means “brother” or “friend.”


In pop culture, the comic book character Lucky Luke had a horse named Jolly Jumper that often exclaimed “Ach!” instead of neighing.

The word ach is sometimes used in internet slang as an abbreviation for “actually.”

The use of ach to refer to a friend or companion can vary from one country to another. In Colombia, for example, it is more common in the Andean region, while in the Caribbean region, the word “parcero” is used more often.