Definition of Big

Adjective: big (bigger,biggest) big

Above average in size, number, quantity, magnitude or extent
"set out for the big city"; "a big barn"; "big businesses"; "a big expenditure"; "a big group of scientists";
- large
Significant
"graduation was a big day in his life"
Very intense
"in a big rage"; "had a big shock";
- bad
Loud and firm
"a big voice"; "big bold piano sounds"
Conspicuous in position or importance
"a big figure in the movement"; "big man on campus";
- large, prominent
Prodigious
"big spender"; "big eater";
- heavy
Exhibiting self-importance
"big talk";
- boastful, braggart, bragging, braggy, cock-a-hoop, crowing, self-aggrandizing, self-aggrandising [Brit]
Feeling self-importance
"too big for his britches";
- swelled, vainglorious
(of animals) fully developed
- adult, full-grown, fully grown, grown, grownup
Marked by intense physical force
"a big wind"
Generous and understanding and tolerant
"a heart big enough to hold no grudges"; "that's very big of you to be so forgiving";
- large, magnanimous
Given or giving freely
"was a big tipper";
- bighearted, bounteous, bountiful, freehanded, handsome, giving, liberal, openhanded
In an advanced stage of pregnancy
"was big with child";
- enceinte, expectant, gravid, great, large, heavy, with child
Regarded with great favour, approval, or affection especially by the general public
- popular

Adverb: big big

Extremely well
"his performance went over big"
In a boastful manner
"he talked big all evening";
- boastfully, vauntingly, large
On a grand scale
"think big"
In a major way
"the play failed big at the box office"