Joint help or support provided by two or more people working together.
From 'coassist' plus the noun suffix '-ance,' which comes from Latin and indicates a state or action. Forms the abstract noun of the verb 'coassist.'
The '-ance' and '-ence' suffixes create abstract nouns (assistance, presence, absence), and they're so old that we don't always remember they came from Latin verbs—English just uses them automatically!
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