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Wiktionary
variadic

a. (context computing mathematics linguistics English) Taking a variable number of arguments; ''especially'', taking arbitrary many arguments.

Wikipedia
Variadic

In computer science, an operator or function is variadic if it can take a varying number of arguments; that is, if its arity is not fixed.

For specific articles, see:

  • Variadic function
  • Variadic macro in the C preprocessor
  • Variadic templates
  • Variadic templates in C++11