1.Definition: having ones attention or mind or energy engaged

"She keeps herself fully occupied with volunteer activities"

Related Adjective(s):engaged

2.Definition: held or filled or in use

"She keeps her time well occupied", "The wc is occupied"

3.Definition: resided in; having tenants

"Not all the occupied (or tenanted) apartments were well kept up"

Related Adjective(s):tenanted

4.Definition: seized and controlled as by military invasion

"The occupied countries of Europe"