great

Definitions
Examples

(noun): A person of major significance, accomplishment or acclaim.
(noun): The main division in a pipe organ, usually the loudest division.
(noun): (in combinations such as "two-greats", "three-greats" etc.) An instance of the word "great" signifying an additional generation in phrases expressing family relationships.
(adjective): Relatively large in scale, size, extent, number (i.e. having many parts or members) or duration (i.e. relatively long); very big.
(adjective): Of larger size or more importance than others of its kind.
(adjective): (qualifying nouns of family relationship) Involving more generations than the qualified word implies — as many extra generations as repetitions of the word great (from 1510s). [see Derived terms]
(adjective): (followed by 'with') Pregnant; large with young; full of.
(adjective): (except with 'friend' and similar words such as 'mate','buddy') Intimate; familiar.
(adjective): Extreme or more than usual.
(adjective): Of significant importance or consequence; important.
(adjective): (applied to actions, thoughts and feelings) Arising from or possessing idealism; admirable; superior; commanding; heroic; illustrious; eminent.
(adjective): Impressive or striking.
(adjective): Much in use; favoured.
(adjective): (applied to persons) Endowed with extraordinary powers; of exceptional talents or achievements; uncommonly gifted; able to accomplish vast results; remarkable; strong; powerful; mighty; noble.
(adjective): Title referring to an important leader.
(adjective): Doing or exemplifying (a characteristic or pursuit) on a large scale; active or enthusiastic.
(adjective): (often followed by 'at') Skilful or adroit.
(adjective): Very good; excellent; wonderful; fantastic (from 1848).
(adjective): Intensifying a word or expression, used in mild oaths.
(adverb): Very well (in a very satisfactory manner).
(interjection): Expression of gladness and content about something.
(interjection): Sarcastic inversion thereof.

Newton and Einstein are two of the greats of the history of science.
My three-greats grandmother.
A great storm is approaching our shores.
the great auk
great-grandfather, great-great-grandfather, great-great-great-grandfather