A vast region of stars and planets in the Material Universe. In other words, a galaxy as everyone understands it.
And just because we like being obnoxius know-it-alls, Wikipedia has this to say on the subject:
A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas anddust, and an important but poorly understood component tentatively dubbed dark matter.[1][2] The name is from the Greek rootgalaxias [γαλαξίας], meaning "milky," a reference to the Milky Way galaxy. Typical galaxies range from dwarfs with as few as ten million[3] (107) stars up to giants with hundred trillion[4] (1014) stars, all orbiting the galaxy's center of mass. Galaxies may contain many multiple star systems, star clusters, and various interstellar clouds. The Sun is one of the stars in the Milky Way galaxy; theSolar System includes the Earth and all the other objects that orbit the Sun.
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