... is German for: share, proportion
In a mathematical context "Anteil" usually means a share or part of something larger. It is sometimes given by a percentage or fraction or in absolute units. In a financial context "Anteil" often means a partial ownership or at least a partial interest in some business or right.
German: Was ist der Anteil von e's im Wort "Teiler"? Antwort: Zwei Sechstel.
English: What is the proportion of e's in "Teiler? Answer: two sixth.