i

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Mathematics.

Also called imaginary unit. the imaginary number .

a unit vector on the x-axis of a coordinate system.

QUIZ

QUIZ YOURSELF ON "IS" VS. "ARE"

"Is" it time for a new quiz? "Are" you ready? Then prove your excellent skills on using "is" vs. "are."

Question 1 of 7

IS and ARE are both forms of which verb?

have

TAKE THE QUIZ TO FIND OUT

Other definitions for i (2 of 9)

I¹

or i

[ ahy ]

/ aɪ /

noun, plural I's or Is, i's or is.

the ninth letter of the English alphabet, a vowel.

any spoken sound represented by the letter I or i, as in big, nice, or ski.

something having the shape of an I.

a written or printed representation of the letter I or i.

a device, as a printer's type, for reproducing the letter I ori.

Other definitions for i (3 of 9)

I²

[ ahy ]

/ aɪ /

pronoun, nominative I,possessive my or mine,objective me;plural nominative we,possessive our or ours,objective us.

the nominative singular pronoun, used by a speaker in referring to himself or herself.

noun, plural I's.

(used to denote the narrator of a literary work written in the first person singular).

Metaphysics. the ego.

Origin of I

First recorded before 900; Middle English ik, ich, i, Old English ic, ih; cognate with Gothic ik, German ich, Old Norse ek, Latin ego, Greek egṓ, Old Church Slavonic azŭ, Lithuanian aš, Sanskrit ahám

grammar notes for I

See me.

WORDS THAT MAY BE CONFUSED WITH I

aye, eye, I

Other definitions for i (4 of 9)

I³

abbreviation

interstate (used with a number to designate an interstate highway): I-95.

Other definitions for i (5 of 9)

I⁴

Symbol.

the ninth in order or in a series.

(sometimes lowercase) the Roman numeral for 1.Compare Roman numerals.

Chemistry. iodine.

Biochemistry. isoleucine.

Electricity. current (def. 13).

Logic. particular affirmative.

(italics)Physics. isotopic spin.

Other definitions for i (6 of 9)

variant of y-.

Other definitions for i (7 of 9)

-i-

the typical ending of the first element of compounds of Latin words, as -o- is of Greek words, but often used in English with a first element of any origin, if the second element is of Latin origin: cuneiform; Frenchify.

Other definitions for i (8 of 9)

abbreviation

imperator.

incisor.

interest.

intransitive.

island.

isle; isles.

Other definitions for i (9 of 9)

abbreviation

Independent.

Island; Islands.

Isle; Isles.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use i in a sentence

Mahoney helped author the I-STOP legislation based on data his office collected in regard to fraud.
No More Paper Prescriptions: Docs Fight Fraud by Going Electronic|Dale Eisinger|December 18, 2014|DAILY BEAST
As of 2012, there are over 523,000 people across the country on Medicaid waiver lists; over 309,000 of those people have I/DD.
Medicaid Will Give You Money for At-Home Care, but You Might Wait Years|Elizabeth Picciuto|December 2, 2014|DAILY BEAST
Barbra Driskill-Scherer is the mother of 9-year-old Gunnar, who has I/DD.
Medicaid Will Give You Money for At-Home Care, but You Might Wait Years|Elizabeth Picciuto|December 2, 2014|DAILY BEAST
Republicans keep saying Democrats are obsessed with the I-word.
Don’t Be Fooled: The GOP Wants Impeachment|David Freedlander|August 1, 2014|DAILY BEAST

Some Democrats are having more success than others in their I-never-met-the-guy campaigns.
Red State Democrats Ditch Obama|Patricia Murphy|July 29, 2014|DAILY BEAST
James I. sent forth his famous "Counterblast" and in the strongest manner condemned its use.
Tobacco; Its History, Varieties, Culture, Manufacture and Commerce|E. R. Billings.
Clinical study of the blood may be discussed under the following heads: I. Hemoglobin.
A Manual of Clinical Diagnosis|James Campbell Todd
The reader wishes to infallibly remember that the date of the beheading of Charles I. was 1649.
Assimilative Memory|Marcus Dwight Larrowe (AKA Prof. A. Loisette)
As for the slipperiness of the ground, my opponent will run no greater risks than I. I am not the only impatient one.
St. Martin's Summer|Rafael Sabatini
But you are a gambler and so am I. I will play you for those documents against twenty-five thousand francs.
The Joyous Adventures of Aristide Pujol|William J. Locke

British Dictionary definitions for i (1 of 7)

symbol for

the imaginary number √–1Also called: j

British Dictionary definitions for i (2 of 7)

I

/ (aɪ) /

noun plural i's, I's or Is

the ninth letter and third vowel of the modern English alphabet

any of several speech sounds represented by this letter, in English as in bite or hit

something shaped like an I
(in combination)an I-beam

dot the i's and cross the t's to pay meticulous attention to detail

British Dictionary definitions for i (3 of 7)

I¹

/ (aɪ) /

pronoun

(subjective) refers to the speaker or writer

Word Origin for I

C12: reduced form of Old English ic; compare Old Saxon ik, Old High German ih, Sanskrit ahám

British Dictionary definitions for i (4 of 7)

I²

symbol for

chem iodine

physics current

physics isospin

logic a particular affirmative categorial statement, such as some men are married, often symbolized as SiPCompare A, E, O 1

(Roman numeral) oneSee Roman numerals

abbreviation for

Italy (international car registration)

Word Origin for I

(for sense 4) from Latin (aff) i (rmo) I affirm

British Dictionary definitions for i (5 of 7)

-i-

connective vowel

used between elements in a compound wordcuneiform; coniferous Compare -o-

Word Origin for -i-

from Latin, stem vowel of nouns and adjectives in combination

British Dictionary definitions for i (6 of 7)

-i

suffix forming adjectives

of or relating to a region or people, esp of the Middle EastIraqi; Bangladeshi

Word Origin for -i

from an adjectival suffix in Semitic and in Indo-Iranian languages

British Dictionary definitions for i (7 of 7)

abbreviation for

International

Island or Isle

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 i

The symbol for the elementiodine

i The symbol forcurrent

Scientific definitions for i (1 of 2)

[ ī ]

The number whose square is equal to -1. Numbers expressed in terms of i are called imaginary or complex numbers.

Scientific definitions for i (2 of 2)

The symbol for electric current.

The symbol for iodine.

Other Idioms and Phrases with i

see dot the i's and cross the t's.

i

Other definitions for i (2 of 9)

or i

Other definitions for i (3 of 9)

Origin of I

grammar notes for I

WORDS THAT MAY BE CONFUSED WITH I

Other definitions for i (4 of 9)

Other definitions for i (5 of 9)

Other definitions for i (6 of 9)

Other definitions for i (7 of 9)

Other definitions for i (8 of 9)

Other definitions for i (9 of 9)

Words related to i

How to use i in a sentence

British Dictionary definitions for i (1 of 7)

British Dictionary definitions for i (2 of 7)

I

British Dictionary definitions for i (3 of 7)

Word Origin for I

British Dictionary definitions for i (4 of 7)

Word Origin for I

British Dictionary definitions for i (5 of 7)

Word Origin for -i-

British Dictionary definitions for i (6 of 7)

Word Origin for -i

British Dictionary definitions for i (7 of 7)

Medical definitions for i

Scientific definitions for i (1 of 2)

Scientific definitions for i (2 of 2)

Other Idioms and Phrases with i