Native speaker English - English mouthertounge
A native speaker is a person whose mother tongue is a specific language. A bilingual native speaker is a person who has got two mother tongues.
Therefore there are for example native speakers for English/English native speakers or bilingual native speakers for English and German/bilingual native speakers English-German. Such a native translator has therefore English as well as German as his/her mother tongue.
The translations which are processed in our translation office are translated by native speakers. The advantage of such a translation which is conducted by a native speaker is that also in the target country the translation is considered as a local text and therefore appears to be of high quality to the target audience not only content wise but also on a stylistic level.