bis

adv. Music
Again; twice. Used as a direction to repeat a passage.

interj.
Used to request an additional performance.

[French or Italian, both from Latin.]

Second version. It means twice in Old Latin, or encore in French. Ter means three. For example, V.27bis and V.27ter are the second and third versions of the V.27 standard.

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pref.

1. Two; twice: bisalbuminemia.
2. Having two identical but separated complex chemical groups in one molecule: 1,4-bis(5-phenyloxazol-2-yl)-benzene.