Definition of codicil noun from the Oxford Advanced Learner's Dictionary

 

codicil

 noun
noun
BrE BrE//ˈkəʊdɪsɪl//
 
; NAmE NAmE//ˈkɑːdəsl//
 
(law)
 
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an instruction that is added later to a will, usually to change a part of it In the codicil she left the house and its contents to her nephew. Word Origin late Middle English: from Latin codicillus, diminutive of codex, codic-, literally ‘block of wood’, later denoting a block split into leaves or tablets for writing on, hence a book. See code.
See the Oxford Advanced American Dictionary entry: codicil