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We found 22 dictionaries with English definitions that include the word costless:
Click on the first link on a line below to go directly to a page where "costless" is defined.

General (16 matching dictionaries)

1. costless: Merriam-Webster.com [home, info]
2. costless: Collins English Dictionary [home, info]
3. costless: Vocabulary.com [home, info]
4. Costless, costless: Wordnik [home, info]
5. costless: Wiktionary [home, info]
6. Costless, costless: Dictionary.com [home, info]
7. Costless: Online Plain Text English Dictionary [home, info]
8. costless: Webster's Revised Unabridged, 1913 Edition [home, info]
9. costless: Rhymezone [home, info]
10. Costless: AllWords.com Multi-Lingual Dictionary [home, info]
11. costless: Webster's 1828 Dictionary [home, info]
12. costless: Free Dictionary [home, info]
13. costless: Mnemonic Dictionary [home, info]
14. costless: WordNet 1.7 Vocabulary Helper [home, info]
15. costless: LookWAYup Translating Dictionary/Thesaurus [home, info]
16. Costless: Dictionary/thesaurus [home, info]

Business (2 matching dictionaries)

17. costless: Legal dictionary [home, info]
18. costless: Financial dictionary [home, info]

Computing (1 matching dictionary)

19. costless: Encyclopedia [home, info]

Medicine (1 matching dictionary)

20. costless: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

21. costless: Idioms [home, info]

Slang (1 matching dictionary)

22. Costless: Urban Dictionary [home, info]

(Note: See costs for more definitions.)

Quick definitions from WordNet (costless) ▸ adjective:  costing nothing ▸ Also see costs ▸ Words similar to costless ▸ Usage examples for costless ▸ Idioms related to costless (New!) ▸ Popular nouns described by costless ▸ Words that often appear near costless ▸ Rhymes of costless ▸ Invented words related to costless