c.1450 (implied in
perpetration), from L.
perpetratus, pp. of
perpetrare "to perform, to accomplish," from
per- "completely" +
patrare "carry out," originally "bring into existence," from
pater "father" (see
father). Neither good nor bad in L., first used in Eng. in statutes, hence its sense of "to perform criminally."
Perpetrator is 1570, from L.L.
perpetrator, from L.
perpetrare. Police slang shortening
perp (e.g.
perp walk) is Amer.Eng., by 1940s.