Pro bono
WordNet

adjective


(1)   Done for the public good without compensation
WiktionaryText

Adjective



  1. done without fee, generally for clients of humble means
    The firm currently has about half a dozen pro bono cases at any one time.

Adverb



  1. In a manner without fee.
    After he retired, he offered pro bono representation from time to time.
 
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