What is the meaning of the word "big"?

Definitions:

conspicuous in position or importance adjective
- a big figure in the movement
exhibiting self-importance adjective
- big talk
extremely well adverb
- Their performance went over big.
feeling self-importance adjective
- They thought of themselves as big time.
generous and understanding and tolerant adjective
- a heart big enough to hold no grudges
given or giving freely adjective
- was a big tipper
in a boastful manner adverb
- You talked big all evening.
in a major way adverb
- the play failed big at the box office
loud and firm adjective
- a big voice
marked by intense physical force adjective
- a big wind
on a grand scale adverb
- think big
significant adjective
- Graduation is a big day in a student's life.