WordReference Random House Learner's Dictionary of American English © 2015
fan•tas•tic /fænˈtæstɪk/USA pronunciation adj. 
  1. thought of and created by an unrestrained imagination;
    grotesque:fantastic rock formations.
  2. not based on reality; imaginary;
    irrational:fantastic fears.
  3. extremely great:a fantastic salary.
  4. Informal Termsextraordinarily good:a fantastic musical.
fan•tas•ti•cal•ly, adv. 

Collins Concise English Dictionary © HarperCollins Publishers::

fantastic /fænˈtæstɪk/ adj
Also: fantastical
  1. strange, weird, or fanciful in appearance, conception, etc
  2. created in the mind; illusory
  3. extravagantly fanciful; unrealistic: fantastic plans
  4. incredible or preposterous; absurd: a fantastic verdict
  5. informal very large or extreme; great: a fantastic fortune, he suffered fantastic pain
  6. informal very good; excellent
  7. of, given to, or characterized by fantasy
  8. not constant; capricious; fitful
Etymology: 14th Century fantastik imaginary, via Late Latin from Greek phantastikos capable of imagining, from phantazein to make visible

ˌfantastiˈcality, fanˈtasticalness n

'fantastic' also found in these entries:

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