| deaccession | (verb) sell (art works) from a collection, especially in order to raise money for the purchase of other art works | - |
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| deacon | (noun) a cleric ranking just below a priest in Christian churches; one of the Holy Orders | - |
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| (noun) a Protestant layman who assists the minister | Synonyms: Protestant deacon |
| deaconess | (noun) a woman deacon | - |
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| deactivate | (verb) make inactive | Synonyms: inactivate |
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| (verb) remove from active military status or reassign | - |
| deactivation | (noun) the act of deactivating or making ineffective (as a bomb) | Synonyms: defusing |
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| (noun) breaking up a military unit (by transfers or discharges) | Synonyms: inactivation |