ɡɹuːp ɡɹuːp ˈɡɹuːpɪŋ ˈɹædɪkəl any number of entities (members) considered as a unit arrange into a group or groups Can you group these shapes together? form a group or group together a set that is closed, associative, has an identity element and every element has an inverse (chemistry) two or more atoms bound together as a single unit and forming part of a molecule