"undulating" definition, meaning, and origin

Adjective

Moving up and down like waves; wavy.
- From Belgrade the train is hauled by a 2-10-0, and makes good time through undulating country, with vineyards and herds of woolly pigs, over single line to Nish, where the Sofia and Istanbul portion, including through...
- The Borinage coalfield around Mons is another attractive area for the railway enthusiast; it is rather like South Lancashire, with its gently undulating landscape studded with slag heaps and pithead gear and...
Forming a series of regular curves.
- Leaving behind us the town at the bottom of its deep bay, we set out to explore a bluff-headed parallelogramical promontory, bounded by Thurso Bay on the one hand, and Murkle Bay on the other, and which presents to the...

undulation
- In good poetry every word and phrase, as Professor McKail says, reverberates like the sound of a lyre, and leaves after it numberless undulatings. The verse exhales sweet sound, and light-like thought, as perfumes do;...