'Costless' definitions:
Definition of 'costless'
From: WordNet
adjective
Costing nothing; "complimentary tickets"; "free admission" [syn: complimentary, costless, free, gratis(p), gratuitous]
Definition of 'Costless'
From: GCIDE
- Costless \Cost"less\ (k?st"l?s; 115), a. Costing nothing. [1913 Webster]