middleweight

Short definition from Wiktionary

Noun

1. 1
   A weight class in professional boxing between light middleweight or welterweight and super middleweight or cruiserweight; a similar division in wrestling and other sports
2. 2
   A boxer who fights in this division; a similar wrestler etc
3. 3
   A class in between heavy and light.
4. 4
   An employee ranking anywhere between junior and senior.