Artificial intelligent assistant

atop

atop, adv. and prep.
  (əˈtɒp)
  [a prep.1 + top; formerly written divisim.]
  A. adv. On or at the top, above.

1658 Rowland Mouffet's Theat. of Ins. 912 Boil them..in an earthen vessel, take off the skim a top. 1779 in Phil. Trans. LXIX. 534 A black mass a-top, and a metallic mass at bottom. 1877 M. Arnold Sohrab & R. Sel. Poems (1882) 37 From the fluted spine atop, a plume Of horsehair waved.

  b. followed by of.

1672 Penn Spir. Truth 120 Set atop of Christ, that is, over His Head. 1708 S. Centlivre Busie Body iv. ii, You are a-top of the House, and you are down in the Cellar. 1883 W. Sikes in Harper's Mag. Feb. 349/1 A round hole in the greensward atop of the cliff.

  B. prep. [by omission of of.] On the top of.

1655 W. Gurnall Chr. in Arm. 14. xviii. (1669) 67/1 Float a-top the waves. 1713 Derham Phys.-Theol. Addr. 6 Sideways, not under or a-top the Spear. 1868 Hawthorne Amer. Note-Bks. (1879) I. 179 Rushing atop the waves.

Oxford English Dictionary

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