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We found 4 dictionaries with English definitions that include the word costlessly:
Click on the first link on a line below to go directly to a page where "costlessly" is defined.

General (4 matching dictionaries)

1. costlessly: Merriam-Webster.com [home, info]
2. costlessly: Collins English Dictionary [home, info]
3. costlessly: Wordnik [home, info]
4. costlessly: Wiktionary [home, info]

(Note: See costs for more definitions.)

Quick definitions from WordNet (costs) ▸ noun:  pecuniary reimbursement to the winning party for the expenses of litigation ▸ Also see costs ▸ Words similar to costlessly ▸ Usage examples for costlessly ▸ Idioms related to costlessly (New!) ▸ Popular adjectives describing costlessly ▸ Words that often appear near costlessly ▸ Rhymes of costlessly ▸ Invented words related to costlessly