Definition of undulate verb from the Oxford Advanced Learner's Dictionary

 

undulate

 verb
verb
BrE BrE//ˈʌndjuleɪt//
 
; NAmE NAmE//ˈʌndʒəleɪt//
 
[intransitive](formal)Verb Forms present simple I / you / we / they undulate
BrE BrE//ˈʌndjuleɪt//
 
; NAmE NAmE//ˈʌndʒəleɪt//
 
he / she / it undulates
BrE BrE//ˈʌndjuleɪts//
 
; NAmE NAmE//ˈʌndʒəleɪts//
 
past simple undulated
BrE BrE//ˈʌndjuleɪtɪd//
 
; NAmE NAmE//ˈʌndʒəleɪtɪd//
 
past participle undulated
BrE BrE//ˈʌndjuleɪtɪd//
 
; NAmE NAmE//ˈʌndʒəleɪtɪd//
 
-ing form undulating
BrE BrE//ˈʌndjuleɪtɪŋ//
 
; NAmE NAmE//ˈʌndʒəleɪtɪŋ//
 
 
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to go or move gently up and down like waves The countryside undulates pleasantly. Wordfinderbarren, fertile, landscape, lush, mountainous, rolling, rugged, undulate, volcanic, wooded Word Origin mid 17th cent.: from late Latin undulatus, from Latin unda ‘a wave’.
See the Oxford Advanced American Dictionary entry: undulate