One of the mysteries of the English language finally explained.
For the public good, now usually with the implication of no financial recompense. Also occasionally attributive or as adjective Compare "pro bono [adjective]".
Mid 17th century; earliest use found in Henry Parker (1604–1652), political writer. From post-classical Latin pro bono publico for the public good from classical Latin prō + bonō, ablative of bonum, use as noun of neuter of bonus + pūblicō, ablative of pūblicus.
pro bono publico/ˌprəʊ ˌbəʊnəʊ ˈpʊblɪkəʊ/
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