Definitions from Wiktionary ( )

▸ adjective:  Taking much space; large.
▸ adjective:  (of an abstract noun) Much, more than usual.
▸ adjective:  (informal, British) Intensifying a word or expression, used in mild oaths.
▸ adjective:  (informal) Very good; excellent; wonderful; fantastic.
▸ adjective:  Important, consequential.
▸ 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:  (obsolete, postpositive, followed by 'with') Pregnant; large with young; full of.
▸ adjective:  (obsolete, except with 'friend' and similar words such as 'mate', 'buddy') Intimate; familiar.
▸ adjective:  (applied to actions, thoughts and feelings) Arising from or possessing idealism; admirable; commanding; illustrious; eminent.
▸ adjective:  Impressive or striking.
▸ adjective:  Much in use; favoured.
▸ adjective:  (applied to persons) Of much talent or achievements.
▸ adjective:  Doing or exemplifying (a characteristic or pursuit) on a large scale; active or enthusiastic.
▸ noun:  A person of major significance, accomplishment or acclaim.
▸ noun:  (music) 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.
▸ adverb:  (informal) Very well (in a very satisfactory manner).

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