undefinedfunction
nounUK /ˌʌndɪˈfaɪnd ˈfʌŋkʃən/
US /ˌʌndɪˈfaɪnd ˈfʌŋkʃən/
A function is a set of steps that does a job, and undefined means nobody has said what those steps are yet.
The program stopped because it tried to use an undefinedfunction that was never written.
OTHER MEANINGS
2. In programming, a call to a function name that has not been declared or defined anywhere in the code.
The compiler flagged an undefinedfunction error on line 12.
3. A mathematical relation that has not been given a rule or formula.
Until we set the rule, this undefinedfunction cannot produce any output.
4. Any task or role whose duties have not been specified.
The new team role was still an undefinedfunction during the first week.