pro bono
US /ˌproʊ ˈboʊ.noʊ/
UK /ˌproʊ ˈboʊ.noʊ/

1.
denoting work undertaken for the public good without charge, especially legal work for a client with a low income
:
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The lawyer offered to take the case pro bono.
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Many firms encourage their lawyers to do pro bono work.
1.
work undertaken for the public good without charge, especially legal work for a client with a low income
:
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He dedicates a significant portion of his time to pro bono.
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The firm is known for its commitment to pro bono.