For questions regarding a star and the area comprising its gravitational dominance. While they are not part of its technical definition, it colloquially refers to the planets, moons, asteroids and other bodies orbiting the star.
A stellar system is comprised of a star and the area over which it has gravitational dominance. The term 'solar system' typically refers to our stellar system, but it is colloquially applied to any star. It may include the planets, moons, asteroids and other bodies orbiting the star. This includes how the different bodies interact and how changes would affect them.