1se·nior 
/ˈsi:njɚ/ adjective
/ˈsi:njɚ/ adjective 1 not used before a noun, US a : older in age — usually + to ▪ She is five years senior to me. = She is senior to me by five years. [=she is five years older than I am]
b — used chiefly in its abbreviated form Sr. to identify a father who has the same name as his son. ▪ John Smith, Jr. and John Smith, Sr. — compare junior 2 : higher in standing or rank than another person in the same position
▪ a senior officer/manager/executive ▪ the senior vice president of marketing ▪ She is a senior aide to the president. ▪ a senior editor for the magazine ▪ He recently became a senior partner in the accounting/consulting firm. — often + to ▪ He is senior to me. — compare junior 3 always used before a noun a : of, relating to, or designed for older people
▪ a senior center ▪ senior housing
b : designed for or done by adults or people over a certain age
▪ the men's senior baseball league ▪ senior golf
b — used chiefly in its abbreviated form Sr. to identify a father who has the same name as his son. ▪ John Smith, Jr. and John Smith, Sr. — compare junior
▪ a senior officer/manager/executive ▪ the senior vice president of marketing ▪ She is a senior aide to the president. ▪ a senior editor for the magazine ▪ He recently became a senior partner in the accounting/consulting firm. — often + to ▪ He is senior to me. — compare junior
▪ a senior center ▪ senior housing
b : designed for or done by adults or people over a certain age
▪ the men's senior baseball league ▪ senior golf
