What is "semiquintile"

Semiquintile \Sem"i*quin`tile\ (s[e^]m"[i^]*kw[i^]n`t[i^]l), n. (Astrol.) An aspect of the planets when distant from each other half of the quintile, or thirty-six degrees.

n. (context astrology English) An aspect of the planets when distant from each other half of the quintile, or thirty-six degrees.