Similar: Inconjunct, Yod, Square, Conjunct, Aspect
A semi-square refers to blocked energy that comes from the emotional and psychological influences of two planets that are 45 degrees apart from each other.
This term is called an aspect in astrology and is considered a minor aspect. A semi-square reveals blocks in our psyche that we must deal with and those blocks are revealed through events or interactions. The birth chart shows the blocks a person will need to deal with in their lifetime through aspects.