(n): one of the elements that collectively form a system of numeration
(n): four performers or singers who perform together
(n): an organization of musicians who perform together
(n): a set of four similar things considered as a unit
(n): a group of things of the same kind that belong together and are so used
(n): four people considered as a unit
(n): a group of persons together in one place
(n): a musical composition for four performers
(n): a musical work that has been created
