(in combinations such as "two-greats", "three-greats" etc.) An instance of the word "great" signifying an additional generation in phrases expressing family relationships.
(qualifying nouns of family relationship) Involving more generations than the qualified word implies β as many extra generations as repetitions of the word great (from 1510s). [see Derived terms]
(applied to persons) Endowed with extraordinary powers; of exceptional talents or achievements; uncommonly gifted; able to accomplish vast results; remarkable; strong; powerful; mighty; noble.