Muster Funeral Home Obituaries, See examples of muster used in a sentence. ); 2 : to gather together (a group of people, soldiers, etc. Muster definition: To call (troops) together, as for inspection. See ‘Meaning & use’ for definitions, usage, and quotation evidence. He traveled around West Africa trying to muster support for his movement. Define muster. Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. muster synonyms, muster pronunciation, muster translation, English dictionary definition of muster. (especially of soldiers) to….