1) Education 2) Educational activity 3) Instruction 4) Pedagogy 5) Teaching 
• (n.) An educating together, as of persons of different sexes or races.
education of males and females in the same schools. A modern phenomenon, it was adopted earlier and more widely in the United States than in Europe, ... [3 related articles]
Co·ed`u·ca'tion noun An educating together, as of persons of different sexes or races. 
[n] - education of men and women in the same institutions
coeducation Education of both genders, or males and females.
noun education of men and women in the same institutions
the joint education of both sexes at the same institution and in the same classes.