According to Wiktionary, Galaxy is defined as "Any of the collections of many millions or billions of stars, galactic dust, black holes, etc. existing as independent and coherent systems, of which there are billions in the known universe," and a Dwarf Galaxy as "Any galaxy, considerably smaller than the Milky Way, that has only several billions of stars."
Since there is no official definition on size, it appears that what can be called a galaxy depends on characteristics such as orbital plane, shape, and distance from other galaxies.
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