relating to a friendly relationship between colleagues (= people who work together)

The organization has a welcoming collegial atmosphere. 机构内气氛融洽，令人感到备受欢迎。

used to describe a method of working in which responsibility is shared between several people

The new chair quickly upset committee members, who were used to a more collegial style. 新主席很快让委员会成员感到不安，他们更加习惯平等商议的风格。