IPA: /əˈsɪstəns/
KK: /əˈsɪstəns/
Help or support given to someone in need.
She received assistance with her homework from her teacher.
Assistance is formed from "assister" (from Latin "assistere", meaning to stand by or help) and the suffix "-ance" (indicating a state or quality). The word "assistance" refers to the state of standing by to help or support someone.
Think of someone 'standing by' ('assister') to 'help' — that's what assistance means.