A question about monotonic sequences

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Are only strictly increasing/decreasing sequences monotonic or can non-decreasing/increasing sequences also be called monotonic ?

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We define a sequence monotonic increasing when $a_{n+1}\ge a_n$ holds and strictly monotonic increasing when $a_{n+1}> a_n$ holds. Therefore the case monotonic increasing includes the case strictly monotonic increasing.

See also the related: Difference between Increasing and Monotone increasing function