Huge (4)

(Other definitions for mega that I've seen before include "Game (anag) -- great" , "Enormous; very good" , "Informally great or large" , "Fantastic!" , "Great American" .)

(Other definitions for vast that I've seen before include "'Huge, immense (4)'" , "Gigantic" , "Astronomical" , "Boundless" , "Extremely large or extensive" .)

(Other definitions for large that I've seen before include "Sizable" , "Bulky" , "Lake" , "Copious" , "Big - 5 down (anag)" .)

(Other definitions for giant that I've seen before include "Extremely tall person" , "Superhuman being" , "Extremely large (person)" , "Titan" , "Jumbo" .)

(Other definitions for major that I've seen before include "Officer with crown" , "Army officer immediately junior to a lieutenant colonel" , "Conservative PM" , "Former PM" , "Significant, main" .)

(Other definitions for great that I've seen before include "Waterbird" , "'Goodness gracious -- -- -- --' (pop song)" , "cracking" , "Large, outstanding" , "Extensive; excellent" .)

(Other definitions for jumbo that I've seen before include "Huge jet" , "Elephant - large - jet" , "Very large, airliner" , "Enormous" , "Elephant sized?" .)

(Other definitions for titanic that I've seen before include "Famously sunken ship" , "Act in it (anag.)" , "Successful movie - disaster ship" , "In act it became an ill-fated ship" , "Of exceptional size or power" .)

(Other definitions for monster that I've seen before include "Large or legendary beast" , "Large, mytical creature" , "On terms (anag) - cruel person" , "Large, ugly and frightening imaginary creature" , "Frightening creature of folklore" .)

(Other definitions for immense that I've seen before include "Extremely large or great" , "Mammoth" , "Very good" , "Vast or enormous" , "Huge, very big indeed" .)

(Other definitions for mammoth that I've seen before include "Extinct species of elephant" , "Large extinct elephant" , "Large, woolly ice-age beast" , "Extinct type of elephant" , "Extinct shaggy-haired elephant" .)

(Other definitions for massive that I've seen before include "Gargantuan" , "Not wavering" , "Enormous" , "Great" , "Exceptionally large" .)

(Other definitions for tremendous that I've seen before include "large" , "Excellent; very great" , "Wonderful" , "Terrific" , "Immense" .)

(Other definitions for gargantuan that I've seen before include "Tremendous" , "Huge" , "Enormous" , "Massive" , "Prodigious" .)

(Other definitions for enormous that I've seen before include "Gross" , "Immense" , "Giant" , "Mammoth" , "Extra-large" .)

(Other definitions for gigantic that I've seen before include "Titanic" , "Fantastically great" , "Exceedingly large" , "'Enormous, mammoth (8)'" , "Hugh,colossal" .)

(Other definitions for colossal that I've seen before include "Huge, immense" , "Gargantuan" , "Giant" , "Great" , "Huge, vast" .)

(Other definitions for big that I've seen before include "London bell" , "Large or substantial" , "Massive" , "Huge" , "oversized" .)

(Other definitions for monstrous that I've seen before include "Quite outrageous" , "Outrageously wrong" , "Outrageously evil" , "Terrible" , "really good!" .)