big

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of considerable size, number, quantity, magnitude, or extent; large. synonym: large.
• adjective Having great strength or force.
• adjective Of great significance; momentous.
• adjective Mature or grown-up.
• adjective Older or eldest. Used especially of a sibling.
• adjective Filled up; brimming over.
• adjective Bountiful; generous.
• adjective Pregnant.
• adjective Having or exercising considerable authority, control, or influence.
• adjective Conspicuous in position, wealth, or importance; prominent.
• adjective Loud and firm; resounding.
• adjective Informal Widely liked, used, or practiced; popular.
• adjective Informal Self-important; cocky.
• adverb In a pretentious or boastful way.
• adverb With considerable success.
• adverb In a thorough or unmistakable way; emphatically.
• idiom (big on) Enthusiastic about; partial to.

from The Century Dictionary.

• Of great strength or power.
• Having great size; large in bulk or magnitude, absolutely or relatively.
• Great with young; pregnant; ready to give birth; hence, figuratively, full of something important; ready to produce; teeming.
• . Distended; full, as of grief, passion, courage, determination, goodness, etc.
• . Tumid; inflated, as with pride; hence, haughty in air or mien, or indicating haughtiness; pompous; proud; boastful: as, big looks; big words.
• . Great as regards influence, standing, wealth, etc.
• Synonyms Large, etc. (see great), bulky, huge, massive.
• 5. Lofty, pompous, arrogant, important.
• . To inhabit; occupy.
• 2. Reflexively, to locate one's self.
• 3. To build; erect; fashion.
• To dwell; have a dwelling.
• noun A kind of winter barley cultivated in northern Europe, especially in Scotland; properly, four-rowed barley, Hordeum vulgare, inferior to but hardier than H. hexastichon, of which it is sometimes called a variety. See bear.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having largeness of size; of much bulk or magnitude; of great size; large.
• adjective Great with young; pregnant; swelling; ready to give birth or produce; -- often figuratively.
• adjective Having greatness, fullness, importance, inflation, distention, etc., whether in a good or a bad sense. As applied to looks, it indicates haughtiness or pride.
• adjective to talk loudly, arrogantly, or pretentiously.
• transitive verb Scot. & North of Eng. Dial. To build.
• noun (Bot.) Barley, especially the hardy four-rowed kind.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of great size, large.
• adjective of an industry or other field Thought to have undue influence.
• adjective Popular.
• adjective informal Adult.
• adjective informal Fat.
• adjective informal Important or significant.
• adjective informal, with on Enthusiastic (about).
• adjective informal Mature, conscientious, principled.
• adjective informal Well-endowed, possessing large breasts in the case of a woman or a large penis in the case of a man.