Relating to or having the function of deleting or deletion; characterized by the removal of elements.
From English delete with the suffix -ory (relating to, serving to). Like -ory words such as 'accusatory' or 'preparatory,' this carries a formal or technical tone, often appearing in legal or scientific contexts.
The -ory suffix is dying out in modern English, replaced by -ing and -ive forms, but in formal and technical writing it persists, creating layers of vocabulary that make technical writing sound more authoritative than it might deserve.
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