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

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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