Etymology
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-ess 
fem. suffix, from French -esse, from Late Latin -issa, from Greek -issa (cognate with Old English fem. agent suffix -icge); rare in classical Greek but more common later, in diakonissa "deaconess" and other Church terms picked up by Latin.
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deacon (n.)

Middle English deken, "one who reads the Gospel in divine worship, one of a body of assistants to a priest or other clergyman," from Old English deacon, diacon, from Late Latin diaconus, from Greek diakonos "servant of the church, religious official," literally "servant," from dia- here perhaps "thoroughly, from all sides," + PIE *kon-o-, from root *ken- "to hasten, set oneself in motion." Related: Deaconess; deaconship.

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