# What is meant by a preliminary run at the LHC?

I am a bit confused over the meaning of "Preliminary run" when referring to the LHC experiments CMS and ATLAS.

For example in this summary, Figure 2 refers to both the CMS $19.7\ \mathrm{fb^{-1}}$ data at $8\ \mathrm{TeV}$ and ATLAS $4.6\ \mathrm{fb^{-1}}$ data at $7\ \mathrm{TeV}$ as "Preliminary":

Which run does the term "Preliminary run" refer to? Or is it used to mean something else?