An educating together, of different sexes or races; -- now used almost exclusively in reference to the education males and females together.

education of men and women in the same institutions

The system of education in which both men and women attend the same institution or classes

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.