greats

noun

1. 1

   A person of major significance, accomplishment or acclaim.

   “Newton and Einstein are two of the greats of the history of science.”

2. 2

   The main division in a pipe organ, usually the loudest division.

3. 3

   (in combinations such as "two-greats", "three-greats" etc.) An instance of the word "great" signifying an additional generation in phrases expressing family relationships.

   “My three-greats grandmother.”