di-

¹ American  

1. variant of dia- before a vowel.

   diorama.

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DI ² American  

1. Department of the Interior.

2. drill instructor.

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di- ³ American  

1. variant of dis- before b, d, l, m, n, r, s, v, and sometimes g and j: digest; divide.

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Di ⁴ American  

[dahy] / daɪ /

noun

1. a female given name, form of Diana.

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di- ⁵ American  

1. a prefix occurring in loanwords from Greek, where it meant “two,” “twice,” “double” (diphthong ); on this model, freely used in the formation of compound words (dicotyledon; dipolar ) and in chemical terms (diatomic; disulfide ).

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Di ⁶ American  

Symbol, Chemistry.

1. didymium.

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di. ⁷ American  

Or dia

abbreviation

1. diameter.

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di ⁸ American  

[dee] / di /

Or Di

preposition

1. from; of: used in Italian personal names, originally to indicate place of origin.

   Conte di Savòia.

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di ⁹ American  

[dee] / di /

noun

Music.

1. a tone in the ascending chromatic scale between do and re.

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DI ¹ British  

abbreviation

1. Defence Intelligence

2. Detective Inspector

3. Donor Insemination

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Di ² British  

symbol

1. didymium

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di- ³ British  

prefix

1. twice; two; double

   dicotyledon

2. 1. containing two specified atoms or groups of atoms

      dimethyl ether

      carbon dioxide

   2. a nontechnical equivalent of bi- 1

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di- ⁴ British  

combining form

1. variant of dia-

   diopter

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di– Scientific  

1. A prefix that means “two,” “twice,” or “double.” It is used commonly in chemistry, as in dioxide, a compound having two oxygen atoms.

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Etymology

Origin of di-¹

Middle English ≪ Latin < Greek, combining form representing dís twice, double, akin to dýo two. See bi- ¹, twi-

Origin of di¹

< Italian < Latin dē

Origin of di¹

Perhaps alteration of do ²

Example Sentences

His last World Cup victory came at the Madonna Di Campiglio slalom almost two years ago to the day, although he did begin this season with a second-placed finish in the giant slalom in Soelden.

From Barron's

That goal looked to have sealed the points from Juve but Baldanzi quickly halved the deficit after Michele Di Gregorio palmed away Evan Ferguson's low drive.

From Barron's

Wu Di, a 37-year-old from China’s northeast, said he started doing it seven years ago after serving in the army and working in other jobs, including construction.

From The Wall Street Journal

The appetite for precious metals is expected to continue into 2026, says Antonio Di Giacomo of XS.com.

From The Wall Street Journal

“Prospects for the coming quarters suggest that gold could extend its upward trend if an environment of low real interest rates and moderate growth persists,” says Di Giacomo in a note.

From The Wall Street Journal