additament

noun
ad·​dit·​a·​ment | \ə-ˈdi-tə-mənt\
plural -s

Definition of additament 

: a thing added : addition the latter verses of the chapter were an additament of a later age— S. T. Coleridge

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First Known Use of additament

14th century, in the meaning defined above

History and Etymology for additament

Middle English, from Latin additamentum, from additus (past participle of addere to add) + connective -a- + -mentum -ment

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The first known use of additament was in the 14th century

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