thirty
/ˈθəːti
/cardinal number (plural thirties)
1The number equivalent to the product of three and ten; ten less than forty; 30: thirty or forty years ago thirty were hurt thirty of her school friends (Roman numeral: xxx or XXX) He had no devoted readership and little chance of remaining in print for long, let alone being republished in thirty or forty years' time....
- He is apt to spend thirty or forty pages on an incident to which an equally good writer might devote three.
- But there is no doubt in my mind that people were happier thirty or forty years ago.
1.1 (thirties) The numbers from thirty to thirty-nine, especially the years of a century or of a person’s life: a woman in her thirties she was a famous actress in the thirties...
- Yeah, this record is kind of about what happens when you let your adolescence continue into your thirties.
- These are people who grew up in Ireland in the twenties and thirties and reached maturity in the era of World War Two.
- The woman was described as being aged in her thirties, with mousy brown hair cut in a bowl style and a spotty complexion.
1.2Thirty years old: I’ve got a long way to go before I’m thirty...
- Parents over the age of thirty are becoming a larger proportion of first-time parents.
- I put it behind the desk as requested and followed the doctor, a woman roughly around the age of thirty.
- It is a young population, with the majority under the age of thirty.
1.3Thirty miles an hour: doing about thirty
1.4A size of garment or other merchandise denoted by thirty.
Derivatives
thirtieth
/ ordinal number ...- Jordan is completing his thirtieth year of service with the Army's 35th Signal Brigade and reaching his mandatory retirement date.
- Ranking above Bulgaria were Slovenia, in fourteenth place, Poland in thirtieth place, and Croatia in thirty-third place.
- The commemorative statue was unveiled on the thirtieth anniversary, in January this year.
thirtyfold
- Since then, transfer fees have multiplied thirtyfold.
- When the ice melted, which it did quickly, the sudden reduction in weight caused a thirtyfold increase in volcanic activity, creating the numerous volcanic mountains that now dominate the landscape.
- A thousandfold increase in the computer time invested in the task has brought a thirtyfold improvement in precision.
Origin
Old English thrītig (see three, -ty2). The spelling with initial thi- is recorded in literature in the 15th century, and has been the prevalent form since the 16th century.