operation, s.1Feidhmiú m, oibriú m. (Of law) To come into operation, teacht i bhfeidhm. To be in operation, bheith i bhfeidhm. In full operation, i bhfeidhm ina iomláine. Regulations at present in operation, na rialacha atá ann faoi láthair. Mode of operation, modh oibre. 2aMil: etc: Oibríocht f. bMth: Oibriú m. 3Med: Obráid f. To perform an operation on s.o., obráid a dhéanamh ar dhuine, oscailt ar dhuine. To undergo an operation, dul faoi scian.