'extremum' definitions:

Definition of 'extremum'

From: WordNet
noun
The point located farthest from the middle of something [syn: extreme point, extreme, extremum]
noun
The most extreme possible amount or value; "voltage peak" [syn: extremum, peak]

Definition of 'extremum'

From: GCIDE
  • extremum \extremum\ n.
  • 1. the point located farthest from the middle of something.
  • Syn: extreme point, extreme, extremity. [WordNet 1.5]
  • 2. the most extreme possible amount or value.
  • Syn: peak. [WordNet 1.5]