1. In biology, it refers to the specific location of a gene or DNA sequence on a chromosome. For example, "The locus for eye color is on chromosome 15."
2. In mathematics, it refers to a point, line, or surface that satisfies a certain condition. For example, "The locus of points equidistant from two points is a straight line."
3. In general usage, it can mean the place or site of something. For example, "The locus of the crime was the victim's apartment."
It's important to note that "locious" is not a word in the English language.