senior

adjective

• 1of a more advanced age:he is 20 years senior to Leonard

• 2of or for older or more experienced people.
• British for or denoting schoolchildren above a certain age, typically 11: the senior girls play badminton while the others play hockey
• US of or for the final year at a university or high school.
• relating to or denoting competitors of above a certain age or of the highest status in a particular sport: McCluskey made an instant impact on his senior debut
• (often Senior) [postpositive] (in names) denoting the elder of two who have the same name in a family, especially a father as distinct from his son:Henry James senior

• 3high or higher in rank or status:he is a senior Finance Ministry official the people senior to me in my department

noun

• a person who is a specified number of years older than someone else:she was only two years his senior
• an elderly person, especially an old-age pensioner: the price is £7 for adults and £3.50 for seniors
• a student in one of the higher forms of a senior school: among the pupils was a senior, a boy of about seventeen
• a competitor of above a certain age or of the highest status in a particular sport:at fourteen you move up to the seniors