Artificial intelligent assistant

diminisher

diˈminisher rare.
  [f. as prec. + -er1.]
  One who or that which diminishes or lessens.

1601 Weever Mirr. Mart. A vij, This paynted wether⁓cocke, Arts diminisher, With cowardize beginneth to empeach me. 1637 Clarke Serm. 241 (L.) The diminisher of regal, but the demolisher of episcopal authority.

Oxford English Dictionary

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