extremum

n.	1.	the point located farthest from the middle of something.
	2.	the most extreme possible amount or value.

Thesaurus

Noun	1.	extremum - the point located farthest from the middle of something extreme point, extreme extremity - the outermost or farthest region or point apex, acme, vertex, peak - the highest point (of something); "at the peak of the pyramid"
	2.	extremum - the most extreme possible amount or value; "voltage peak" peak limitation, limit - the greatest amount of something that is possible or allowed; "there are limits on the amount you can bet"; "it is growing rapidly with no limitation in sight" lower limit, minimum - the smallest possible quantity maximum, upper limit - the largest possible quantity