C1 adjective, noun /ɔːɡˈzɪliəri/
auxiliary
вспомогательный
Meaning
(adjective) providing supplementary or additional help and support; (noun) a person or thing that provides auxiliary support
Example
The hospital has an auxiliary power generator in case of emergencies.
В больнице есть вспомогательный генератор энергии на случай чрезвычайных ситуаций.