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substantial

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definition: 
important; strongly made; of value
sentence: 
The discovery of a vaccine for smallpox was a substantial medical achievement.
difficulty: 
easy
toefl frequency: 
2
toefl classification: 
adverb: 
substantially
adjective: 
substantial
adverb sentence: 
adjective sentence: 
verb: 
verb sentence: 
noun: 
noun sentence: