Relating to or involving the addition of something; tending to add or increase.
From Latin 'additorius' (relating to addition). This term appears in technical and formal contexts where 'additive' might be used, though it's quite rare in modern English.
This word is almost entirely confined to legal documents and old technical writing—it's the forgotten cousin of 'additive' and appears in phrases about additory clauses or additory provisions in contracts.
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