What does emcient mean?

"Emcient" is not a real word. It's likely a misspelling of "efficient".

Efficient means:

* Performing or functioning in the best possible manner with the least waste of time and effort.

* Producing a desired result with the least waste of resources.

For example:

* "The new system is much more efficient than the old one."

* "She's a very efficient worker."