Fecho

Fecho is a Portuguese word with multiple related meanings tied to closing, fastening, or enclosing. It is used across different domains, including everyday language, textiles, architecture, and mathematics.

As a noun, fecho can denote the act of closing or the thing that closes, i.e., a closing mechanism or device. It can refer to the moment of closing something, the closing lines of a letter, the end of a period, or the final part of a document. In everyday use, it occurs in phrases such as fecho de porta (door lock), fecho de correr (zipper), or fecho de pressão (snap fastener).

As a verb form, fecho is the first-person singular present indicative of fechar: eu fecho means I close.

In mathematics, fecho is a technical term for closure, the smallest closed set that contains a given set; fecho topológico is common in topology.

Additionally, fecho appears in other specialized terms and contexts, such as fecho de uma carta referring to the closing part of a correspondence or fecho de uma casa referring to the locking mechanism of a door. The precise meaning depends on context.