Meaning of “frontal system” in the English Dictionary

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"frontal system" in British English

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frontal systemnoun [ C ]

uk /ˈfrʌn.təl ˌsɪs.təm/ us /ˈfrʌn.t̬əl ˌsɪs.təm/ specialized

a combination of weather conditions in which one or more weather fronts can be recognized:

With so many frontal systems so close together, we can expect the weather to be highly changeable over the next few days.

(Definition of “frontal system” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)