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

 

irreplaceable

 adjective
adjective
BrE BrE//ˌɪrɪˈpleɪsəbl//
 
; NAmE NAmE//ˌɪrɪˈpleɪsəbl//
 
 
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too valuable or special to be replaced These pictures are irreplaceable. Synonymsvaluableprecious priceless irreplaceableThese words all describe something that is worth a lot of money or very important to somebody.valuable worth a lot of money:The thieves took three pieces of valuable jewellery.precious rare and worth a lot of money; loved or valued very much:a precious Chinese vase, valued at half a million pounds precious memories of our time togetherpriceless extremely valuable; loved or valued very much:a priceless collection of antiquesirreplaceable too valuable or special to be replacedPatterns valuable/​precious/​priceless/​irreplaceable possessions valuable/​precious/​priceless antiques/​jewels/​jewellery opposite replaceable
See the Oxford Advanced American Dictionary entry: irreplaceable