sen·ior

[seen-yer]
adjective
1.
older or elder (designating the older of two men bearing the same name, as a father whose son is named after him, often written as Sr. or sr. following the name): I'd like to speak with the senior Mr. Hansen, please. I'm privileged to introduce Mr. Edward Andrew Hansen, Sr. Compare junior ( def 1 ).
2.
of earlier appointment or admission, as to an office, status, or rank: a senior partner.
3.
of higher or the highest rank or standing.
4.
(in American schools, colleges, and universities) of or pertaining to students in their final year or to their class.
5.
(in certain American colleges and universities) of or pertaining to the final two years of education, during which a student specializes in a certain field of study.
6.
of, for, or pertaining to a senior citizen or senior citizens as a group: senior discounts on local bus fares.
7.
of earlier date; prior to: His appointment is senior to mine by a year.
8.
Finance. having a claim on payments, assets, dividends, or the like prior to other creditors, mortgages, stockholders, etc.
noun
9.
a person who is older than another.
10.
a person of higher rank or standing than another, especially by virtue of longer service.
11.
(in the U.S.) a student in the final year at a high school, preparatory school, college, or university.
12.
a fellow holding senior rank in a college at an English university.
14.
( initial capital letter ) a member of the Girl Scouts from 14 through 17 years of age.
00:10
Senior is always a great word to know.
So is ort. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a scrap or morsel of food left at a meal.

Origin:
1350–1400; Middle English < Latin, equivalent to sen(ex) old, old man + -ior comparative adj. suffix

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World English Dictionary
senior (ˈsiːnjə) [Click for IPA pronunciation guide]
 
adj
1.  higher in rank or length of service
2.  older in years: senior citizens
3.  of or relating to adulthood, maturity, or old age: senior privileges
4.  education
 a.  of, relating to, or designating more advanced or older pupils
 b.  of or relating to a secondary school
5.  (US) of, relating to, or designating students in the fourth and final year at college
 
n
6.  a senior person
7.  an elderly person
8.  a.  a senior pupil, student, etc
 b.  a fellow of senior rank in an English university
 
[C14: from Latin: older, from senex old]

Senior (ˈsiːnjə) [Click for IPA pronunciation guide]
 
adj
chiefly (US) Sr, Abbreviation: Sen being the older: used to distinguish the father from the son with the same first name or names: Charles Parker, Senior

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

senior
late 13c., from L. senior "older," comparative of senex (gen. senis) "old," from PIE base *sen- (see senile). Original use in English was as addition to a personal name when father and son had the same name; meaning "higher in rank, longer in service" first recorded 1510s.
The L. word yielded titles of respect in many languages, cf. Fr. sire, Sp. señor, It. signor. Noun sense of "fourth-year student" is from 1741, from earlier general sense of "advanced student" (1610s). Seniority "priority on office or service" is from mid-15c. Senior citizen first recorded 1938, Amer.Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Senior rates on airline tickets give older travelers the opportunity to travel
  for a fraction of the cost of other travelers.
The senior took his seat, and cleared away the trees from his ears to listen.
The information on the following pages has been developed specifically for
  senior drivers.
Everybody wants to do business with senior executives: there is bound to be
  lots of money involved.
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