For Decan (Decanate) we have a term and definition in Astrology.

A one-third (ten-degree) sector of a sign. Each sign has three decanates: 0-10 degrees, 11-20 degrees and 21-30 degrees. Each decan has its own ruler. Each decan is divided into two faces, a positive and a negative, each with its own ruler. Decanates themselves are also known as faces.
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