Dictionary.com

thirtieth

[ thur-tee-ith ]
/ ˈθɜr ti ɪθ /

adjective

next after the twenty-ninth; being the ordinal number for 30.
being one of 30 equal parts.

noun

a thirtieth part, especially of one (1/30).
the thirtieth member of a series.

QUIZZES

BECOME A PRO CHEF WITH THIS EXQUISITE CUISINE QUIZ!

Even if you can't be a professional chef, you can at least talk like one with this vocabulary quiz.
Question 1 of 9
You may have read the word "simmer" in a recipe or two, but what does it really mean?
To cook in water that begins cold and then reaches a boil.
To stew in a sauce for a long time.
To cook in water, just below boiling temperature.
TAKE THE QUIZ TO FIND OUT

Origin of thirtieth

before 900; thirty + -eth2; replacing Middle English thrittythe,Old English thrītegtha

Words nearby thirtieth

Thirteen Colonies, thirteen-lined ground squirrel, thirteenth, Thirteenth Amendment, thirteenth chord, thirtieth, thirty, Thirty days hath September, thirty-eight, thirty-eighth, thirty-fifth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for thirtieth

British Dictionary definitions for thirtieth

thirtieth
/ (ˈθɜːtɪɪθ) /

adjective

(usually prenominal)
  1. being the ordinal number of thirty in counting order, position, time, etc: often written 30th
  2. (as noun)the thirtieth of the month

noun

  1. one of 30 approximately equal parts of something
  2. (as modifier)a thirtieth part
the fraction equal to one divided by 30 (1/30)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012