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Definition of firmest:
(n) :
(UK, business) A business partnership; the name under which it trades.
(n) :
(business, economics) A business enterprise, however organized.
(n) :
(slang) A criminal gang, especially based around football hooliganism.
(adj) :
Steadfast, secure, solid (in position)
(adj) :
Fixed (in opinion).
(adj) :
Insistent upon something, not accepting dissent.