IPA: /ˌʌn.dʒʊˈleɪ.ʃən/
KK: /ʌnˈdʌleɪʃən/
A smooth, wave-like movement or pattern that rises and falls regularly.
The undulation of the hills created a beautiful landscape.
Undulation is formed from "undula" (from Latin "unda", meaning wave) and the suffix "-tion" (meaning the action or process of). The word describes the action or process of moving in waves or a wavy motion.
Think of 'waves' ('unda') to remember that 'undulation' refers to a wavy movement or motion.