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We introduce a new notion of Almgren's frequency which is adapted tosolutions of a sub-Laplacian (harmonic functions) on a Carnot group ofarbitrary step $\bG$. With this notion we investigate some new functionalsassociated with the frequency, and obtain monotonicity formulas for therelevant harmonic functions, or for the solutions of a closely connected classof degenerate second order operators of Baouendi type. The results proved inthis paper provide some new insight into the deep link existing between thegrowth properties of the frequency, and the local and global structure of therelevant harmonic functions in these non-elliptic, or subelliptic, settings

Frequency of Harmonic functions in Carnot groups and for operators of Baouendi type