Translating the word "chorus"

Hi everyone!

I'm sorry, but I'm translating the change-and-adjust-sounds to spanish, but I have no idea what the word chorus does in this context means. My sound support doesn't work because some incompatibility with ALSA sound drivers. I'm really busy during this months, and since I don't need sound for editing scores, I've never cared.

So the cuestion is wich kind of effect is "chorus". For me, chorus is some people singing together, or a part of a song wich everybody should sing or play together. But I have no Idea wich kind of sound effect is chorus, the same way I now what reverberation does, or panning.

Thanks!