in·tro·mis·sion (ĭn'trə-mĭsh'ən) n. The act or process of intromitting; introduction or admission.
[Medieval Latin intrōmissiō, intrōmissiōn-, usurpation, from Latin intrōmissus, past participle of intrōmittere, to intromit; see intromit.] in'tro·mis'sive (-mĭs'ĭv) adj.