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Latin word firmare 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.
firmare (Latin)