[n] the greatest possible degree; "he tried his utmost"
[n] the point on a curve where the tangent changes from positive on the left to negative on the right
[n] the largest possible quantity
[adj] the greatest or most complete or best possible; "maximal expansion"; "maximum pressure"
greatest, highest, largest, level best, maximal, outside, peak(a), supreme, top, upper limit, utmost, uttermost