I, 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.

Definition for i (2 of 11)

i


Mathematics.

Also called imaginary unit. the imaginary number .
a unit vector on the x-axis of a coordinate system.

Definition for i (3 of 11)

I


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

Definition for i (4 of 11)

I

[ 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

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

Can be confused

aye eye I

Usage note

See me.

Definition for i (5 of 11)

I


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.

Definition for i (6 of 11)

I


Symbol, Physics. isotopic spin.

Definition for i (7 of 11)

i-


variant of y-.

Definition for i (8 of 11)

Definition for i (9 of 11)

I.


Island; Islands.
Isle; Isles.

Definition for i (10 of 11)

-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.

Definition for i (11 of 11)

iota

[ ahy-oh-tuh ]
/ aɪˈoʊ tə /

noun

a very small quantity; jot; whit.
the ninth letter of the Greek alphabet (I, ι).
the vowel sound represented by this letter.

Origin of iota

1600–10; < Latin iōta < Greek iôta < Semitic; compare Hebrew yōdh yod
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for i (1 of 7)

i

I

/ () /

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
  1. something shaped like an I
  2. (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 (2 of 7)

i


symbol for

the imaginary number √–1Also called: j

British Dictionary definitions for i (3 of 7)

I

1
/ () /

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)

I

2

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.


abbreviation for

International
Island or Isle

British Dictionary definitions for i (6 of 7)

iota

/ (aɪˈəʊtə) /

noun

the ninth letter in the Greek alphabet (Ι, ι), a vowel or semivowel, transliterated as i or j
(usually used with a negative) a very small amount; jot (esp in the phrase not one or an iota)

Word Origin for iota

C16: via Latin from Greek, of Semitic origin; see jot

British Dictionary definitions for i (7 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
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

Medicine definitions for i (1 of 2)

I


The symbol for the elementiodine
i The symbol forcurrent

Medicine definitions for i (2 of 2)

iota

[ ī-ōtə ]

n.

The ninth letter of the Greek alphabet.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for i (1 of 3)

i

[ ī ]

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

Science definitions for i (2 of 3)

I


The symbol for electric current.
The symbol for iodine.

Science definitions for i (3 of 3)

iodine

[ īə-dīn′ ]

I

A shiny, grayish-black element of the halogen group. It is corrosive and poisonous and occurs in very small amounts in nature except for seaweed, in which it is abundant. Iodine compounds are used in medicine, antiseptics, and dyes. Atomic number 53; atomic weight 126.9045; melting point 113.5°C; boiling point 184.35°C; specific gravity (solid, at 20°C) 4.93; valence 1, 3, 5, 7. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with i (1 of 2)

i


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

Idioms and Phrases with i (2 of 2)

iota


see not one iota.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.