Also called imaginary unit. the imaginary number .
a unit vector on the x-axis of a coordinate system.
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Question 1 of 10
Definition for i (2 of 9)
[ 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 (3 of 9)
[ 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 I2
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
grammar notes for I
Definition for i (4 of 9)
interstate (used with a number to designate an interstate highway): I-95.
Definition for i (5 of 9)
Definition for i (6 of 9)
variant of y-.
Definition for i (7 of 9)
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 (8 of 9)
Definition for i (9 of 9)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for i (1 of 7)
/ (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 (2 of 7)
the imaginary number √–1Also called: j
British Dictionary definitions for i (3 of 7)
/ (aɪ) /
(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)
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)
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)
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)
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
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Idioms and Phrases with i
see dot the i's and cross the t's.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.