c.1300, "crime of stealing what is consecrated to God," from O.Fr. sacrilege (12c.), from L. sacrilegium "temple robbery," from sacrilegus "stealer of sacred things," from phrase sacrum legere "to steal sacred things," from sacrum "sacred object (from neuter sing. of sacer "sacred") + legere "take, pick up" (see lecture). Second element is related to lecture, but is not from religion. Transf. sense of "profanation of anything held sacred" is attested from 1390. Sacrilegious is from 1582.