Taking a variable number of arguments; especially, taking arbitrarily many arguments.(adjective)
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Use "variadic" in a sentence
"This testing framework tries to keep testing quick and simple by avoiding complex compiler features such as variadic macros or C99 features that may not be ..."
"This is what allowed us to easily implement variadic emplacement, and should make it easier to squash bugs in the future."
"Now we define variadic templates themselves as macros with lots of backslash-continuations, then expand them with master macros."