WordReference Random House Learner's Dictionary of American English © 2026
I, i /aɪ/USA pronunciation
n. [countable], pl. I's or Is, i's or is.
I /aɪ/USA pronunciation pron., [nom.] I, poss. my or mine, obj. me;
pl. [nom.] we, poss. our or ours, obj. us;
n., pl. I's.
pron.
n. [countable]
I, an abbreviation of:
WordReference Random House Unabridged Dictionary of American English © 2026- Linguisticsthe ninth letter of the English alphabet, a vowel.
I /aɪ/USA pronunciation pron., [nom.] I, poss. my or mine, obj. me;
pl. [nom.] we, poss. our or ours, obj. us;
n., pl. I's.
pron.
- (used as the singular subject pronoun by a speaker or writer in referring to himself or herself):I'll be happy to see you. Am I glad to see her!
n. [countable]
- Philosophythe ego;
the self:the "I'' of the narrator.
I, an abbreviation of:
- Transport, Pronounsinterstate (used with a number to designate an interstate highway):I-95.
I, i
(ī),USA pronunciation n., pl. I's or Is, i's or is.
I (ī),USA pronunciation pron., nom. I, poss. my or mine, obj. me;
pl. nom. we, poss. our or ours, obj. us;
n., pl. I's.
pron.
n.
I,
I, Symbol.
i, [Math.]
I,
i-,
-i-,
I.,
- Linguisticsthe ninth letter of the English alphabet, a vowel.
- Linguisticsany 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 ori.
- a device, as a printer's type, for reproducing the letter I ori.
I (ī),USA pronunciation pron., nom. I, poss. my or mine, obj. me;
pl. nom. we, poss. our or ours, obj. us;
n., pl. I's.
pron.
- the nominative singular pronoun, used by a speaker in referring to himself or herself.
n.
- (used to denote the narrator of a literary work written in the first person singular).
- Chemistry[Metaphys.]the ego.
- bef. 900; Middle English ik, ich, i; Old English ic, ih; cognate with German ich, Old Norse ek, Latin ego, Greek egó̄, Old Church Slavonic azù, Lithuanian aŝ, Sanskrit ahám
- See me.
I,
- Transport, Pronounsinterstate (used with a number to designate an interstate highway):I-95.
I, Symbol.
- the ninth in order or in a series.
- (sometimes l.c.) the Roman numeral for 1. Cf. Roman numerals.
- [Chem.]iodine.
- Biochemistryisoleucine.
- [Elect.]current.
- Philosophy[Logic.]See particular affirmative.
i, [Math.]
- Also called imaginary unit. the imaginary number &fullradicoverminus1;
. - a unit vector on the x-axis of a coordinate system.
I,
- Symbol, Physics. isotopic spin.
i-,
- var. of y-.
-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.
I.,
- Independent.
- Island;
Islands. - Isle;
Isles.
- imperator.
- incisor.
- interest.
- Grammarintransitive.
- island.
- isle;
isles.
'I, i' also found in these entries (note: many are not synonyms or translations):
i
- one
- adminicle
- aliment
- alinotum
- amplexicaul
- apsidiole
- aren't
- auri-
- beatific
- clavicorn
- cornel
- cornicle
- cubicle
- curriculum
- damsel
- decrepit
- document
- double modal
- emolument
- eterne
- even permutation
- fibula
- flori-
- foment
- forceps
- frigorific
- geniculate
- gratify
- gratitude
- id
- -ify
- I'm
- India
- I.N.R.I.
- I've
- lassitude
- latifundium
- latitude
- lick
- monument
- morbific
- myself
- nidifugous
- nigrify
- nigritude
- odoriferous
- orifice
- panniculus
- plantigrade