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• n  an undulating curve
• n  wavelike motion; a gentle rising and falling in the manner of waves
• n  (physics) a movement up and down or back and forth

• The other undulation at Yale was part of undergraduatedom's persistent demand for liberty.
• These tiny, fugitive-looking images, in which luminous fragments of nature-pines bowing before a wind, the undulation of a flock of cranes-were painted in colored inks on .
• As a result, Ondine offered few pyrotechnics, gained its effects instead through sinuous mass movements in which the undulation of arm and body suggested forests of sea plants .

• wave

News & Articles

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• Phil Mickelson uses wedge off putting green at Merion
  As you can see, he's quite confident with wedge in hand. So confident, that on Sunday at Merion he opted to take wedge off the green, keeping putter in the bag at No. 15. A significant undulation between his ball and the far back-right pin location prompted the unusual move.
  June 16, 2013 - Philly.com

Quotes

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• Ian Poulter in The Associated Press
  When you finally get here and actually see how they have sculptured the holes around the ocean, it's pretty amazing,Poulter said. "There's a lot of undulation, which you don't expect, and you don't pick that up from TV. It just blew me...
• Jim Tracy in Colorado Rockies News
  It's not up to Major League standards right now,Tracy said. "It's really rough out there. It's very, very difficult for an outfielder to play out there. The ground has been beaten down. There's undulation to it. The ball's changing...