“Lowest floor” in Japanese
Short answer
Lowest floor in Japanese is “最下階” (saikakai). Full meaning: bottom floor, lowest floor.
Other ways to say “Lowest floor” in Japanese
一層
issou even more, still more, all the more, more than ever; one layer; lowest floor (of a building)
いつそう
issou even more, still more, all the more, more than ever; one layer; lowest floor (of a building)
いっそう
issou even more, still more, all the more, more than ever; one layer; lowest floor (of a building)
一そう
issou even more, still more, all the more, more than ever; one layer; lowest floor (of a building)
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