senior

1 senior /ˈsiːnjɚ/ adjective
1 senior
/ˈsiːnjɚ/
adjective
Britannica Dictionary definition of SENIOR
1 
not used before a noun US
a  : older in age — usually + to
b  — used chiefly in its abbreviated form Sr. to identify a father who has the same name as his son. — compare junior
2 
: higher in standing or rank than another person in the same position
— often + to — compare junior
3 
always used before a noun
a  : of, relating to, or designed for older people
b  : designed for or done by adults or people over a certain age
2 senior /ˈsiːnjɚ/ noun
plural seniors
2 senior
/ˈsiːnjɚ/
noun
plural seniors
Britannica Dictionary definition of SENIOR
[count]
1 
: a person who is older than another person
— compare junior
2 
: a person who is of a higher rank than another person
3 
US : a student in the final year of high school or college — often used before another noun
— compare freshman, junior, sophomore
4 
chiefly US : senior citizen