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Word meanings come from one of two dictionaries, depending on the language. Whichever answered is named and linked on the definition card itself, so the credit sits with the meaning rather than only at the bottom of a page.
When you add a word by hand, the example sentences offered come from Tatoeba, a collection of sentences written and translated by volunteers.
When Wiktionary has no entry for a word, usually a long German compound, the meaning shown is a machine translation from MyMemory, and the card says so.
Words you save carry the same credit into the file when you export them, so it travels with the meanings rather than staying behind on the site.
How common a German word is, which the report uses to estimate the level of a video and of your vocabulary, comes from a list counted over film and TV subtitles.
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