However, the Empire uses time units of generally similar lengths.

When possible Empires used a common religion or culture to strengthened the political structure.

It is the place where the British Empire used to execute people by hanging till death.

When she sang, she could break your heart or mend it, but that was before the Empire found and used her.

And in the first place the whole Empire must use the English language.

"And imprisoned in a place the Empire uses to create covert operatives, correct?"

Did the aliens have any technological secrets the Empire could use?

The Empire is using you to kill your own kind.

The Empire uses its military superiority to quickly put the Federation on the defensive.

The Empire had used them for communication, commerce, and, most important of all, quick movement of its legions.