Beweis

German Wikipedia has an article on:

Beweis

Wikipedia ^de

German

From the verb beweisen.

Beweis m (strong, genitive Beweises, plural Beweise)

(countable) proof
- 2010, Der Spiegel‎^[1], number 23/2010, page 75:
  Erst in den neunziger Jahren etablierte sich die sogenannte evidenzbasierte Medizin, die systematisch nach Beweisen für die Wirksamkeit von Medikamenten sucht.
  Only in the '90s did the so-called evidence-based medicine establish itself, which systematically searches for proof of the effectiveness of medical drugs.
(mathematics) proof
(in the plural) evidence, proof (collectively)

Generally, a Beweis is understood to be one piece of evidence that suffices to prove something. The plural Beweise can refer either to a plurality of such sufficient proofs, or to pieces of evidence that become proof by their combination. Therefore the German plural is often equivalent to the English uncountable singular. For example: Es gibt Beweise für die Entdeckung Amerikas durch die Wikinger. (“There is proof for the Vikings’ discovery of America.”)
The singular is used in German as in English for an intellectual study aimed at proving something, as in ein mathematischer Beweis (“a mathematical proof”).

Declension of Beweis [masculine, strong]

¹Now rare, see notes.