Source : Webster's Revised Unabridged Dictionary (1913)

Germanism \Ger"man*ism\, n. [Cf. F. germanisme.]
   1. An idiom of the German language.

   2. A characteristic of the Germans; a characteristic German
      mode, doctrine, etc.; rationalism. --J. W. Alexander.

Source : WordNet®

Germanism
     n : a custom that is peculiar to Germany or its citizens