additament

[uh-dit-uh-muh nt] /əˈdɪt ə mənt/
noun
1.
something added; an addition.
Origin
1400-50; late Middle English < Latin additāmentum, equivalent to addit(us) (past participle) added (see addition) + -ā- (by analogy with verbal derivatives such as ornāmentum ornament) + -mentum -ment
Related forms
additamentary
[uh-dit-uh-men-tuh-ree] /əˌdɪt əˈmɛn tə ri/ (Show IPA), adjective