Relating to or characteristic of a particular climate or climate system.
From climata (plural of clima) plus the English suffix -al, meaning 'of or relating to.' This formation follows the pattern of creating adjectives from noun forms.
This word is rarely used in modern English because we usually just say 'climatic,' but it shows how English speakers create new adjectives by adding -al to any noun—we could theoretically say 'climatal zones' instead of 'climate zones.'
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