Graduation is the awarding of a diploma to a student by an educational institution. It may also refer to the ceremony that is associated with it. The date of the graduation ceremony is often called graduation day. The graduation ceremony is also sometimes called: commencement, congregation, convocation or invocation. Ceremonies for graduating students date from the first universities in Europe in the twelfth century. At that time Latin was the language of scholars. A universitas was a guild of masters (such as MAs) with licence to teach. "Degree" and "graduate" come from gradus, meaning "step". The first step was admission to a bachelor's degree. The second step was the masters step, giving the graduate admission to the universitas and license to teach. Typical dress for graduation is gown and hood, or hats adapted from the daily dress of university staff in the Middle Ages, which was in turn based on the attire worn by medieval clergy. The tradition of wearing graduation hats in Sweden has been in place since the mid-eighteenth century. The cap is typically a white sailor hat with a black or dark blue band around it, a crown motif, and a black peak at the front. The graduation hat tradition was initially adopted by students at Uppsala University. The headgear then became popular across several other European nations as well. Usually the ceremony and name apply to university degrees (Associate's, Bachelor's, Master's and Doctoral degrees). In a graduation ceremony at the college and university level, the presiding officer or another authorized person formally confers degrees upon candidates, either individually or en masse, even though graduates may physically receive their diploma later at a smaller college or departmental ceremony, or simply receive their diploma through the mail. Ceremonies often include a procession of some of the academic staff and candidates and a valediction. The academic staff will usually wear an academic dress at the ceremony, as will the trustees (if applicable) and the degree candidates.