An addition is any segment of text that a copyist introduces into the copied text (one that is not present in the exemplar). In the process of collating and editing the term addition is a relative one which only indicates that a segment of text which is lacking in the base-text is present in some witness(es), without making a judgement whether the addition is secondary or not.
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DE: Hinzufügung
FR: addition
IT: addizioneaggiunta / interpolazione
AC, CM