letterlocking

The English word “letterlocking” has 1 meaning listed here.

noun

The securing of a letter without an envelope, by folding and cutting so that portions of the paper can be interlocked.

From letter + locking; coined in 2009 by researcher Jana Dambrogio.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.