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declivitous

adjective
de·​cliv·​i·​tous | \ di-ˈkli-və-təs How to pronounce declivitous (audio) \

Definition of declivitous

: moderately steep

First Known Use of declivitous

1799, in the meaning defined above

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Time Traveler for declivitous

The first known use of declivitous was in 1799

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Britannica English: Translation of declivitous for Arabic Speakers

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