Synonym: 30th. Similar words: thirty, thirteen, twentieth, thirteenth, multiethnic, shirt, tie to, T-shirt. Meaning: ['θɜrtɪɪθ /'θɜː-] 
n. position 30 in a countable series of things. adj. coming next after the twenty-ninth in position.
n. position 30 in a countable series of things. adj. coming next after the twenty-ninth in position. 
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1 It's due on the thirtieth.
2 For my thirtieth birthday, my friends clubbed together and bought me a watch.
3 I'm planning to leave on the thirtieth .
4 Tomorrow is the thirtieth anniversary of the revolution.
5 Larsson bagged his thirtieth goal of the season in Celtic's win.
6 The thirtieth of June was a fairly typical day.
7 Harry celebrated his thirtieth birthday with a meal in a fancy restaurant.
8 A week later, on my thirtieth birthday, Mom called again, this time from her apartment.
9 An impending thirtieth birthday and a two and a half year-old daughter called Sophie haven't turned her fashion tastes one whit.
10 On the thirtieth of December the doctor called again and pronounced Ruth fit to get up.
11 He was yet to reach his thirtieth birthday, Magee thought, but ravaged beyond his years.
12 I arrived in the thirtieth position of the marathon.
13 A day is about one thirtieth of a month.
14 The thirtieth on the list is a young man.
15 I'd like to go to Shanghai on December thirtieth.
16 That was their thirtieth wedding anniversary.
17 The thirtieth math question was the hardest.
18 Please hand in your paper before June thirtieth.
19 January the thirtieth and you're invited.
20 Thirtieth Olympiad is held with Yu in United Kingdom London in 2012.
21 One second of arc movement is one thirtieth of a millimetre.
22 John scored a goal in the thirtieth minute of the match.
23 The present crop of books and documentaries about Marilyn Monroe exploit the thirtieth anniversary of her death.
24 Steven Jobs built his own computer company from scratch and became a multimillionaire before his thirtieth birthday.
25 Just a few weeks ago,[www.Sentencedict.com] Sefton was enjoying his thirtieth birthday party.
26 I think the scientists' way of expressing such a figure, ten to the thirtieth power, is really more convenient.
27 Their best striker, Lu Ming , scored in the thirtieth minute.
28 The Expo will be on the first of May and end on the thirtieth of October.
29 Mister W . resigned last month . His last day is June thirtieth.
30 In the middle of the month, I invited my high school classmates to the White House for our thirty-fifth high school reunion—as I had done five years earlier, for our thirtieth.
More similar words: thirty, thirteen, twentieth, thirteenth, multiethnic, shirt, tie to, T-shirt, third, thirst, thirsty, thirst for, two-thirds, sortie, courtier, airtight, third reich, third party, third world, portiere, properties, bloodthirsty, ethic, ethics, ethical, seething, rethink, ethically, for one thing, something.