1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Additament \Ad*dit"a*ment\ ([a^]d*d[i^]t"[.a]*ment), noun [L. additamentum, fr. additus, p. p. of addere to add.] An addition, or a thing added. --Fuller. My persuasion that the latter verses of the chapter were an additament of a later age. --Coleridge.

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