senior

adjective

• 1of a more advanced age:he is 20 years senior to Leonard
• of or for students in the final year of college or high school.
• relating to or denoting competitors of above a certain age or of the highest status in a particular sport.
• British of, for, or denoting schoolchildren above a certain age, typically eleven.
• (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

• 2holding a high and authoritative position:he is a senior Finance Ministry official
• [predic.] (senior to) holding a higher position than: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 one who is retired and living on a pension.
• a student in the final year of college or high school.
• British a student in a school for older children, especially those eleven and over.
• a competitor of above a certain age or of the highest status in a particular sport:at fourteen you move up to the seniors