A sequence of four elements.
One of a group of four, particularly one of four babies born from the same mother during the same birth.
A tuplet of four notes.
A cycle for carrying four riders, arranged so that all the riders can assist in the propulsion.
A musical composition in four parts, each performed by a single voice or instrument.
A group of four musicians who perform classical music together.
A group of four singers, usually males, who sings together in four-part harmony.
A group of four people or things, particularly