Correct spelling, explanation: this word comes directly from Latin (also senior), meaning older. The word hasn’t been changed in any way in English, it is a direct loanword. Therefore seniour or any other change in spelling is incorrect. The only correct form is senior.
Definition of senior:
adjective, of a higher competence or older
He doesn’t have enough experience to become a senior manager.
noun, somebody older than another, usually in the family (father-son relation); in school: a student in their last year or final class
James is a senior in our family; James Jr is his son.
Incorrect spelling, explanation: seniour is a misspelling, probably made due to the fact, that -or in American English is often written as -our in British English. This word, senior, is however a Latin loanword, and it is spelled exactly like in Latin. Therefore senior is the only correct form.
Incorrect spelling
Incorrect spelling
Incorrect spelling
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Very nice to know the actual spelling of the word senior.
This English dictionary was… How should I say it? Helpful! At last I’ve found something that helped me. Cheers!