Jargon or technical language is the specialized terminology associated with a particular field or area of activity. Jargon is normally employed in a particular communicative context and may not be well understood outside that context. The context is usually a particular occupation, but any ingroup can have jargon. The key characteristic that distinguishes jargon from the rest of a language is its specialized vocabulary, which includes terms and definitions of words that are unique to the context, and terms used in a narrower and more exact sense than when used in colloquial language. This can lead outgroups to misunderstand communication attempts. Jargon is sometimes understood as a form of technical slang and then distinguished from the official terminology used in a particular field of activity.

Chinook Jargon is a language originating as a pidgin trade language in the Pacific Northwest. It spread during the 19th century from the lower Columbia River, first to other areas in modern Oregon and Washington, then to British Columbia and parts of Alaska, Northern California, Idaho and Montana, sometimes taking on the characteristics of a creole language. It is partly descended from the Chinook language, upon which much of its vocabulary is based. Approximately 15 percent of its lexicon is French, and it also makes use of English loan words and those of other language systems. Its entire written form is in the Duployan shorthand developed by French priest Émile Duployé.