tenth

I. tenth¹ /tenθ/ BrE AmE adjective
coming after nine other things in a series:
in the tenth century
her tenth birthday
—tenth pronoun:
I’m planning to leave on the tenth (=the tenth day of the month).

Oxford Advanced Learner's Dictionary

tenth

tenth [tenth tenths] ordinal number, noun [tenθ] [tenθ]

ordinal number

10th There are examples of how to use ordinal numbers at the entry for fifth.

noun
each of ten equal parts of sth

see possession is nine tenths of the law at possession

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

tenth / tenθ / ordinal number

10th written as a word:

This is his tenth year of working for the company.

Our next meeting is on the tenth ( of April).

The team was/came tenth in the league.

Collins COBUILD Advanced Learner’s English Dictionary

tenth

[te̱nθ]
♦♦
tenths
1) ORD The tenth item in a series is the one that you count as number ten.
2) FRACTION A tenth is one of ten equal parts of something.
He finished three-tenths of a second behind Prost.

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary:

tenth

²tenth adj : occupying the number ten position in a series
• This year is our tenth wedding anniversary.
• the tenth grade
- tenth adv
• the world's tenth largest country