What does RIFT mean?

Looking for the full meaning of RIFT? From the following image, you can find out all definitions of RIFT. If you want, you can also download image file to print.

AcronymDefinition
RIFTReactor In-Flight Test System
RIFTReactor in Flight Test
RIFTResin Infusion Under Flexible Tooling

What does rift stand for?