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additory

[ad-i-tawr-ee, -tohr-ee]
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adjective
  1. capable of or tending to make an addition; additional; supplementary.
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Origin of additory

First recorded in 1650–60; addit(ion) + -ory1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018