Hello Min, It depends on the context; it could mean: - all established as the highest level or best performance. - all regulated to achieve accuracy. - all altered to conform to a certain standard. - all equipped with the required tools and equipments. - all ready for use for a particular event or purpose. - all put in a certain location. - all arranged in an attractive way. - all determined or decided upon.

ready prepared

It means that you are ready to go somewhere :D

"All Set" as in "I'm all set!" means ready, i.e. before going somewhere, one might say "I'm all set" to tell others that they are ready to leave.