onefunction
nounUK /wʌnˈfʌŋkʃən/
US /wʌnˈfʌŋkʃən/
A thing that does only one job.
This little button is a onefunction switch that only turns the light on.
OTHER MEANINGS
2. A computer program or routine that performs just one action.
The app uses a onefunction script to rename files.
3. A person who focuses on only one role or duty.
In the small team, he was a onefunction helper who only handled mail.
4. A design or tool built for a single use.
The old can opener is a onefunction gadget with no extra parts.