Princeton's WordNet (0.00 / 0 votes) Rate this definition: occupied (adj). held or filled or in use. she keeps her time well occupied; the wc is occupied. occupied (adj). seized and controlled as by military invasion.the occupied countries of Europe. occupied, tenanted (adj).resided in; having tenants.rinceton's WordNet (0.00 / 0 votes) Rate this definition: occupied (adj). held or filled or in use. she keeps her time well occupied; the wc is occupied. occupied (adj). seized and controlled as by military invasion.