This is the 13678th most frequent German word.
eingespielt
"Well-rehearsed" or "experienced and accustomed (as a team or system)."
In this context, 'eingespielt' refers to a group, such as a team, that has become proficient and harmonized through experience.
Das Team ist sehr gut eingespielt.
The team is very well rehearsed.
Here, 'eingespielt' implies that the musicians have practiced and are now ready to perform.
Nach der Probe fühlten sich alle Musiker eingespielt.
After the rehearsal, all the musicians felt warmed up.
In this instance, 'eingespielt' is used to indicate that the system has been set up or configured again.