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pro bo·no(prō bō′nō)
Provided free or at low cost to certain legal clients in order to serve the public good: a lawyer's pro bono representation of low-income families.
[Latin prō bonō (publicō), for the (public) good : prō, for + bonō, ablative of bonum, the good.]
(Law) US of or relating to free legal work on cases in which a defendant is unable to pay for his own defence
(Law) US free of charge, for a defendant who is unable to pay for his own defence
or pro-bo•no(ˌproʊ ˈboʊ noʊ)
done or donated without charge; free: pro bono legal services.
[1720–30; < Latin: for (the) good, rightly, morally]