The Meaning of SIS – SIS means “Sister“. It is an internet acronym. What does SIS mean? SIS is an abbreviation that stands for “Sister”. Check the content shared below on this page to find out SIS definition and all the information related to acronym SIS in FAQ format.

What does SIS mean?

SIS is an acronym, abbreviation or slang word which means “Sister”. It is used during chats and online conversations on forums, social networking sites and chat rooms.

The Meaning of SIS

SIS means “Sister”.

What is SIS?

SIS is “Sister”.

SIS Definition / SIS Means

The definition of SIS is “Sister”.