/ut"euhr mohst'/ or, esp. Brit., /-meuhst/ , adj.
1. most remote or outermost; farthest: the uttermost stars.
2. of the greatest or highest degree, quantity, etc.; greatest: The country's art has reached uttermost creativity.
n.
3. utmost.
[ 1300-50; ME; see UTTER 2 , -MOST ]