I. ˈə-tər-ˌmōst adjective
Etymology: Middle English, alteration of uttermest, from utter (I) + -mest (as in utmest utmost)
Date: 14th century
1. : outermost
2. : extreme , utmost
II. noun
Date: 14th century
: utmost
to the uttermost of our capacity — H. S. Truman