c. 1600, "made more dense, compressed, compacted," past-participle adjective from condense. Of literary works, from 1823. Condensed milk is attested by 1863. Condensed type (1854) is thinner than compressed.
"to rob on the high seas; commit piracy upon," 1570s, from pirate (n.). By 1706 as "appropriate and reproduce the literary or artistic work of another without right or permission; infringe on the copyright of another." Related: Pirated; pirating.