知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。is actually a prefix Which means 50 percent, partly, or a thing that is slightly inferior. The prefix demi– is derived from the Old French word demi which means 50 %, derived from your Latin phrase dimidius. The prefix demi– is not noticed pract