Technical terminology is the specialized
vocabulary of a field. These terms have specific definitions within the field, which is not necessarily the same as their meaning in common use.
Jargon is similar, but more informal in definition and use, while legal terms of art or words of art have meanings that are strictly defined by law.
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an expression or phrase that has a defined meaning when used in a particular context or knowledge environment (such as the patenting process, pharmaceuticals, computers, etc.)
Context: Patent