undulation

noun

un·​du·​la·​tion ˌən-jə-ˈlā-shən 

ˌən-dyə-,

ˌən-də-

1

a

: a rising and falling in waves

b

: a wavelike motion to and fro in a fluid or elastic medium propagated continuously among its particles but with little or no permanent translation of the particles in the direction of the propagation : vibration

2

: the pulsation caused by the vibrating together of two tones not quite in unison

3

: a wavy appearance, outline, or form : waviness

Examples of undulation in a Sentence

Recent Examples on the Web

Experienced hikers will love the challenging undulation of the Coastal Path. —AFAR Media, 28 Aug. 2025

Known for his thoughtful and innovative approach to course architecture, Jones threaded the holes through subtle undulations that present a challenge even for seasoned golfers. —Katie Sweeney, Forbes.com, 13 Aug. 2025

But what separates The Wave is the smooth, wavelike undulation of the rocks, the result of millions of years of wind and water erosion. —Michael Salerno, AZCentral.com, 15 July 2025

And there’s an undulation that resembles a female orgasm that steps away from this 1-2-3, punch of the climax and a sigh of relief in the last five minutes, and the movie’s over. —Anne Thompson, IndieWire, 18 May 2025

Word History

First Known Use

1646, in the meaning defined at sense 1a

Rhymes for undulation

• abdication
• aberration
• abjuration
• abnegation
• abrogation
• acceptation
• acclamation
• acclimation
• accusation
• activation
• actuation
• acylation

Kids Definition

undulation

noun

un·​du·​la·​tion ˌən-jə-ˈlā-shən 

ˌən-d(y)ə-

1

: the action of undulating

2

: a wavy appearance or form : waviness