What is ariba means in English?

"Ariba" is not a word in English. It is likely that you are referring to Ariba Network, which is a global business-to-business (B2B) e-commerce network.

It was originally a company called Ariba, Inc. which was later acquired by SAP. So, "Ariba" can also be used as a shorthand for the software and services provided by Ariba Network.