a series of related numbers in a particular order a sequence a formal talk given to a group of people, especially at university a lecture a period in European history, approximately between the years 500 and 1500 the Middle Ages the study of lines, angles and surfaces in mathematics geometry a person who studies or teaches mathematics mathematician found in many places common https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_default.swf