The condition of two oscillators which are half a cycle out of phase with each other.

J. COLLINS and I. STEWART write: "The antisynchronous motion has its own symmetry: the oscillation pattern is unchanged if the two oscillators are interchanged and their respective phase shifted by half a cycle"

Furthermore: "Coupled networks of three or more oscillators have more complicated oscillation patterns that just synchrony and antisynchrony and some of these patterns are highly counter-intuitive" (1994, p.39)