decil

from The Century Dictionary.

• noun An aspect or position of two planets when they are a tenth part of the zodiac (36°) distant from each other.
• noun In mathematics, an object or term occupying a place whose ordinal corresponds to 10 or to a multiple of 10. Also decile.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Astrol.) An aspect or position of two planets, when they are distant from each other a tenth part of the zodiac, or 36°.