Wordnet 3.0
ADJECTIVE (1)
1. 
 determining payment based on the actual cost of production plus an agreed-upon fee or rate of profit; 
- Example: "a cost-plus government contract"
The Collaborative International Dictionary of English v.0.48:
cost-plus \cost-plus\ adj.
   determining payment based on the actual cost of production
   plus an agreed-upon fee or rate of profit; as, a cost-plus
   government contract.
   [WordNet 1.5]
WordNet (r) 3.0 (2006):
cost-plus
    adj 1: determining payment based on the actual cost of
           production plus an agreed-upon fee or rate of profit; "a
           cost-plus government contract"