1informalvery good, especially in a way that makes you feel happy and excited [= great]:
That's a terrific idea!
The actress who played the lawyer was terrific.
2very large in size or degree:
a terrific bang
He drank a terrific amount of beer.
WORD FOCUS: good WORD FOCUS: good very good:excellent, fantastic, wonderful, great, terrific, neatAmerican English, superb, amazing, outstanding, brilliant, impressive, fine, first-class, out of this world of good quality:high quality, top quality, superior, deluxe, classy morally good:decent, virtuous, respectable, honourableBritish English/honorableAmerican English, upright, beyond reproach ➔ See alsogood
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.