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21st vs 21th

The correct phrase is "21st." The suffix "st" is used for ordinal numbers ending in 1 (e.g., 1st, 21st, 31st). The suffix "th" is used for most other ordinal numbers.

Last updated: April 09, 2024 • 2114 views

This phrase is correct. The suffix "st" is used for ordinal numbers ending in 1.

"21st"

Use "21st" when referring to the ordinal number 21 in a date or sequence.

Examples:

  • The 21st of December is the winter solstice.
  • She finished in 21st place in the race.
  • The new Memorial Hospital includes 21st Century technology.
  • Fast forward to 21st century China.
  • The Harmony Technology is built using 21st century Quantum Physics.
  • Earth, 21st century by the looks of it.
  • Welcome to a 21st century custody battle.
  • Especially with his 21st birthday coming up.
  • It was dated Portia's 21st birthday.
  • And the last one was her 21st.
  • We made 21st century money, and that was groundbreaking.
  • You'll work for us until your 21st birthday.
  • Yes, it was my 21st birthday.
  • But yesterday was my 21st birthday.
  • On my 21st birthday, just you and me...
  • I spent my 21st birthday in jail for that one.
  • North Korea occupies the entire 21st floor, which is locked down tight.
  • This bloke's made a 21st century version of his portrait.
  • Claire gave Adam this watch for his 21st birthday.
  • The morning after Jane's 21st birthday was somewhat less festive than the night before.
  • If I remember correctly, your old man also worked the 21st.
  • My grandmother gave me this on my 21st birthday.

Alternatives:

  • 21st
  • twenty-first
  • the 21st

This phrase is incorrect. The suffix "th" is not used for ordinal numbers ending in 1.

"21th"

  • Our slogan for the 21th century:
  • Opening of 21th PriMed with the audience award
  • 2010 The 21th International Youth Prayer Festival, Medjugorje, 1. - 6.
  • 21th edition of the festival of sacral art
  • It is therefore viewed as one of the most serious health problems in the 21th century, consuming over 6% of European health care budget.
  • Through natural processes described here should be probably explained one of the greatest imaginable mystery of 20th - 21th century - Crop Circles.
  • Dehon, in the 21th century Print this page 19/06/2014 Spiritual path for lay dehonians.
  • Fabric Light Box forever 21th century led sanp open aluminum alloy
  • The 21th edition of the Winter Cup which took place, as usual, on the Italian circuit of Lonato, was a formidable success.
  • The 64 km tunnel is a 21th century pioneering piece of engineering and it will improve the viability of public and freight transport in the heart of Europe.
  • The 21th edition of GeoFluid, which has been held in October, showed, this year too, a considerable increase in number of visitors, customers and dealers from abroad looking for our Made in Italy innovation.
  • Company Toyota - for the year fell from seventh to 21th place, worsening performance
  • Two solo exhibitions by Zach Blas and Heather Dewey-Hagborg in Eindhoven Biotechnology, AI and the Internet of Things are shaping the 21th century as we speak.
  • Submissions are closed for the 21th edition of PriMed festival
  • In several countries, on March 21th events will took place.
  • Permanent color is the hype of the 21th century.
  • In collaboration with VCC Enrico Bernardi.Wednesday, September 21th at 21.
  • February 21th is the day dedicated to mother language.
  • Even if he means the 21th century.
  • As of June 21th, that check has not yet been processed.

Alternatives:

  • 21st
  • twenty-first
  • the 21st

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