armamentarium UK /ˌɑːməmənˈtɛəɹi.əm/US /ˌɑɹməmənˈtɛɹi.əm/ noun1 •All of the equipment available for carrying out a task, especially all the equipment used by a physician in the practice of medicine.The most important tool in the photographer's armamentarium for evaluating the range of possibilities at each site is his or her feet. — 2021 formsarmamentaria · armamentariums