The integrated education of men and women at the same school facilities; co-ed is a shortened adjectival form of co-educational. Before the 1960s, many private institutions of higher education restricted their enrollment to a single sex. Indeed, most institutions of higher education—regardless of being public or private—restricted their enrollment to a single sex at some point in their history. " Coed" is an informal (and increasingly archaic) term for a female student attending such a college or university.

Coeducation is the integrated education of males and females at the same school facilities. The opposite situation is described as single-sex education. Most older institutions of higher education restricted their enrollment to a single sex at some point in their history, and became coeducational.