plural of quadruple star system

(astronomy) A stellar system that has four stars orbiting around each other; quadruple star

(music) A meter or rhythm with four beats to a measure and four beats to a whole note. Specifically common time.

plural of quadruple whole note

(US, music) A note with twice or thrice the value of a double whole note.

(music) A tuplet of four notes. / 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.

plural of quadruplet

Having four components. / Of or relating to a system in telegraphy by which four messages (two in each direction) can be sent on one wire simultaneously.

A quadruplex system.

(transitive) To make quadruplex.