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di

1

or Di

[ dee ]
/ di /
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preposition
from; of: used in Italian personal names, originally to indicate place of origin: Conte di Savòia.
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Origin of di

1
<Italian <Latin

Other definitions for di (2 of 9)

di2
[ dee ]
/ di /

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

Origin of di

2
Perhaps alteration of do2

Other definitions for di (3 of 9)

Di
[ dahy ]
/ daɪ /

noun
a female given name, form of Diana.

Other definitions for di (4 of 9)

Di

Symbol, Chemistry.
didymium.

Other definitions for di (5 of 9)

DI

Department of the Interior.
drill instructor.

Other definitions for di (6 of 9)

di-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).
Also dis-2.
Compare mono-.

Origin of di-

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

Other definitions for di (7 of 9)

di-2

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

Other definitions for di (8 of 9)

di-3

variant of dia- before a vowel: diorama.

Other definitions for di (9 of 9)

di.

or dia


abbreviation
diameter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use di in a sentence

British Dictionary definitions for di (1 of 4)

Di

the chemical symbol for
didymium

British Dictionary definitions for di (2 of 4)

DI

abbreviation for
Defence Intelligence
Detective Inspector
Donor Insemination

British Dictionary definitions for di (3 of 4)

di-1

prefix
twice; two; doubledicotyledon
  1. containing two specified atoms or groups of atomsdimethyl ether; carbon dioxide
  2. a nontechnical equivalent of bi- 1 (def. 5c)

Word Origin for di-

via Latin from Greek, from dis twice, double, related to duo two. Compare bi- 1

British Dictionary definitions for di (4 of 4)

di-2

combining form
variant of dia- diopter
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

Medical definitions for di

di-

pref.
Two; twice; double:dichromatic.
Containing two atoms, radicals, or groups:diiodide.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for di

di-

A prefix that means “two,” “twice,” or “double.” It is used commonly in chemistry, as in dioxide, a compound having two oxygen atoms.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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