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a tall cliff, with a narrow footpath at its base
The pituitary gland is at the base of the brain.
The manufacturer's name is printed on the base of the vase.
Terrorists had been using the warehouse as a base for their operations.
Hikers find this a convenient base for their mountain expeditions.
Income from magazine publishing provides the company with a strong financial base.
The report will give us a base for building a better healthcare system.
a broad base of experience/knowledge/expertise
They have built a loyal customer base.
This is the American English definition of base. View British English definition of base.