Definition of "argot"
noun:
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A secret language or conventional slang peculiar to thieves, tramps and vagabonds.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
The specialized informal vocabulary and terminology used between people with special skill in a field, such as between doctors, mathematicians or hackers; a jargon.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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