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2012-10-31 02:31:22 -0500 answered a question What is opencv_world package in OpenCV 2.4.3 rc?

The 2.4.3 is the version ID. rc in "Software release life cycle" stands for "Release Candidate".
rc means: beta version with potential to be a final product, which is ready to release unless significant bugs emerge.
It is up to you for using it or not. If you are in hurry to use the newest features go for building installing, if not, take it easy and use the 2.4.2 release.