Astronomy. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. (usually initial capital letter) Milky Way.
any large and brilliant or impressive assemblage of persons or things: a galaxy of opera stars.
any of a vast number of star systems held together by gravitational attraction in an asymmetric shape (an irregular galaxy) or, more usually, in a symmetrical shape (a regular galaxy), which is either a spiral or an ellipse Former names island universe, extragalactic nebula, related adjective galactic
a splendid gathering, esp one of famous or distinguished people
the Galaxy, the spiral galaxy, approximately 100 000 light years in diameter, that contains the solar system about three fifths of the distance from its centre Also known as the Milky Way System See also Magellanic Cloud