Definition of considerable adjective from the Oxford Advanced Learner's Dictionary

    

considerable

 adjective
adjective
BrE BrE//kənˈsɪdərəbl//
 
; NAmE NAmE//kənˈsɪdərəbl//
 
(rather formal)
 
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great in amount, size, importance, etc. synonym significant The project wasted a considerable amount of time and money. Damage to the building was considerable. Considerable progress has been made in finding a cure for the disease. Word Origin late Middle English (in the sense ‘capable of being considered’): from medieval Latin considerabilis ‘worthy of consideration’, from Latin considerare ‘examine’, perhaps based on sidus, sider- ‘star’.Extra examples They can run quite considerable distances. Caring for elderly relatives requires considerable moral courage. The animal was in considerable distress.
See the Oxford Advanced American Dictionary entry: considerable