Synonym of double-edged sword: a benefit that is also a liability. / Used other than figuratively or idiomatically: see dual, edged, sword.

plural of dual-edged sword

plural of second-person dual

Synonym of touch-tone dialing

A classification into two subclasses or opposed parts. / (projective geometry) The interchangeability of points and planes.

(physics) The concept applying to all matter and radiation, but most evident in light and particles such as the electron, that properties of waves and of particles are exhibited simultaneously

Of or relating to dualism.

Duality; the condition of being double. / (philosophy) The view that the world consists of, or is explicable in terms of, two fundamental principles, such as mind and matter or good and evil.

plural of duality

plural of dualism