uppermost

Universal Words adjective, adverb adjective 1 [usuallybeforenoun] (written) higher or nearer the top than other things: the uppermost branches of the tree 2 [notusuallybeforenoun] more important than other things in a particular situation: These thoughts were uppermost in my mind. * Defence is no longer uppermost in their priorities. adverb (written) in the highest position; facing upwards: Place the material on a flat surface, shiny side uppermost.