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German word Firma comes from Proto-Indo-European *dʰerw-, and later Latin firmus (Faithful, steadfast, true. Stable, strong, firm.)
*dʰerw- (Proto-Indo-European)
*dʰer-mo-s (Proto-Indo-European)
firmus (Latin)
Faithful, steadfast, true. Stable, strong, firm.
firmo (Latin)
I make firm, strengthen, harden, fortify.
firmare (Italian)
(transitive) to sign (a document etc.).
firma (Italian)
Signature.
Firma (German)
(colloquial) A company. A firm, the name under which a company operates.