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| English | Irish |
| fast reactor Nuclear reactor which produces more fissile material than it consumes, using fast-moving neutrons and making plutonium-239 from uranium-238, thereby increasing the reactor's efficiency | imoibreoir tapa |
| fast-start financing | mearmhaoiniú tosaigh |
| fast-start financing | mearmhaoiniú |
| fast-start funding | mearmhaoiniú tosaigh |
| fast-start funding | mearmhaoiniú |
| fast traffic No definition needed | trácht thapa |