A poetic or literary term for a step or degree; a gradation (archaic, poetic).
An archaic or dialectal variant, possibly influenced by or related to Old English and Scots usage of words related to 'grad' (step) with the suffix '-an'.
Old Scottish and Northern English poetry used 'graddan' to mean a rung on a ladder or stage in a journey—it's the kind of obscure word that survives only in dusty literary collections and place names.
Complete word intelligence in one call. Free tier — 50 lookups/day.