Definition of "harmonical"

The CGLE is a general model that describes the behavior of reaction-diffusion systems near onset of self-oscillations, while they remain approximately harmonical.

2001 May 18, Minseok Kim et al., “Controlling Chemical Turbulence by Global Delayed Feedback: Pattern Formation in Catalytic CO Oxidation on Pt(110)”, in Science‎, volume 292, number 5520, pages 1357–1360

There follows an "harmonical parallel between the types of the Old Testament and the Four Evangelists' relations of our Lord and Saviour;" also a "discourse of the estate of the Jews," by Dr. Jackson, "The destruction of Jerusalem," and long extracts from a work entitled "Moses unveiled," besides other matter.

1903, J. E. Acland, Little Gidding and its inmates in the Time of King Charles I.‎

The action of the auricles is synchronous; that of the ventricles is the same; that of the auricles and ventricles is consentaneous; and that of the whole heart is rhythmical, or harmonious--the diastole of the auricles occurring in harmonical time with the systole of the ventricles, and vice versa.

1859, Joseph Maclise, Surgical Anatomy‎