ATOP

Pronunciation (US):

(GB):

 I. (adverb) 

Sense 1

Meaning:

On, to, or at the top

Classified under:

Adverbs

Credits

 Context examples: 

On its final flyby of Saturn's largest moon in 2017, NASA's Cassini spacecraft gathered radar data revealing that the small liquid lakes in Titan's northern hemisphere are surprisingly deep, perched atop hills and filled with methane.

(Cassini Reveals Surprises with Titan's Lakes, NASA)