noun, feminine/ɔ.pe.ʁa.sjɔ̃ dy sɛ̃.t‿ɛs.pʁi/plural: opérations du Saint-Esprit
divine intervention, miracle
“par l'opération du Saint-Esprit” — as if by magic
Literally, “operation of the Holy Spirit”, originally describing the means of the miraculous conception of Jesus Christ by the Virgin Mary.