Obs. rare. [ad. L. type *undātio, f. L. undāre to rise in waves. Cf. OF. undation, -acion.] A waving; an undulation.
1656. Blount, Glossogr., Undation, a flowing or rising of waves.
1668. Culpepper & Cole, Barthol. Anat. II. vi. 101. A certain Undation or waving towards one side according to the carriage of the right Ventricle.
