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  1. island.
  2. isle.


  1. Isaiah.
  2. island.
  3. isle.


pronoun, nominative I, possessive my or mine, objective me; plural nominative we, possessive our or ours, objective us.
  1. the nominative singular pronoun, used by a speaker in referring to himself or herself.
noun, plural I's.
  1. (used to denote the narrator of a literary work written in the first person singular).
  2. 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 confusedaye eye I

Usage note

See me.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for is.


abbreviation for
  1. Also: Isa Bible Isaiah
  2. Island(s) or Isle(s)



noun plural i's, I's or Is
  1. the ninth letter and third vowel of the modern English alphabet
  2. 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
  3. dot the i's and cross the t's to pay meticulous attention to detail


symbol for
  1. the imaginary number √–1Also called: j


  1. (subjective) refers to the speaker or writer

Word Origin

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


symbol for
  1. chem iodine
  2. physics current
  3. physics isospin
  4. logic a particular affirmative categorial statement, such as some men are married, often symbolized as SiPCompare A, E, O 1
  5. (Roman numeral) oneSee Roman numerals
abbreviation for
  1. Italy (international car registration)

Word Origin

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

Word Origin and History for is.



12c. shortening of Old English ic, first person singular nominative pronoun, from Proto-Germanic *ekan (cf. Old Frisian ik, Old Norse ek, Norwegian eg, Danish jeg, Old High German ih, German ich, Gothic ik), from PIE *eg-, nominative form of the first person singular pronoun (cf. Sanskrit aham, Hittite uk, Latin ego (source of French Je), Greek ego, Russian ja, Lithuanian ). Reduced to i by mid-12c. in northern England, it began to be capitalized mid-13c. to mark it as a distinct word and avoid misreading in handwritten manuscripts.

The reason for writing I is ... the orthographic habit in the middle ages of using a 'long i' (that is, j or I) whenever the letter was isolated or formed the last letter of a group; the numeral 'one' was written j or I (and three iij, etc.), just as much as the pronoun. [Otto Jespersen, "Growth and Structure of the English Language," p.233]

The form ich or ik, especially before vowels, lingered in northern England until c.1400 and survived in southern dialects until 18c. The dot on the "small" letter -i- began to appear in 11c. Latin manuscripts, to distinguish the letter from the stroke of another letter (such as -m- or -n-). Originally a diacritic, it was reduced to a dot with the introduction of Roman type fonts.

Online Etymology Dictionary, © 2010 Douglas Harper

is. in Medicine


  1. The symbol for the elementiodine
  2. i The symbol forcurrent

is. in Science


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


  1. The symbol for electric current.
  2. The symbol for iodine.

Idioms and Phrases with is.


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