un ‧ du ‧ late /ˈʌndjəleɪt, ˈʌndjʊleɪt $ -dʒə-/ BrE AmE verb [intransitive]
formal to move or be shaped like waves that are rising and falling:
undulating hills
—undulation /ˌʌndjəˈleɪʃ ə n, ˌʌndjʊˈleɪʃ ə n $ -dʒə-/ noun [uncountable and countable]
un ‧ du ‧ late /ˈʌndjəleɪt, ˈʌndjʊleɪt $ -dʒə-/ BrE AmE verb [intransitive]
formal to move or be shaped like waves that are rising and falling:
undulating hills
—undulation /ˌʌndjəˈleɪʃ ə n, ˌʌndjʊˈleɪʃ ə n $ -dʒə-/ noun [uncountable and countable]
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012