A particular weight class, or member of such, as prescribed by the rules, between that of the heavier welterweight and the lighter featherweight. See Wikipedia for the specifics of each sport.
User Defined Definitions
"a professional boxer who weighs between 131 and 135 pounds"
"someone who is unimportant but cheeky and presumptuous"
"an amateur boxer who weighs no more than 132 pounds"
"a wrestler who weighs 139-154 pounds"
"weighing relatively little compared with another item or object of similar use"