- the imaginary number .
- a unit vector on the x-axis of a coordinate system.
- 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.
- the nominative singular pronoun, used in referring to oneself, the person speaking, writing, or otherwise communicating.
- (used to denote the narrator of a literary work written in the first person singular.)
- the ego.
- interstate (used with a number to designate an interstate highway): I-95.
- the ninth in order or in a series.
- the Roman numeral for 1.
- iodine.
- isoleucine.
- current (def. 13).
- particular affirmative.
- isotopic spin.
- variant of y-.
- 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.
- imperator.
- incisor.
- interest.
- intransitive.
- island.
- isle; isles.
- Independent.
- Island; Islands.
- Isle; Isles.
- the imaginary number √–1
- 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)
- to pay meticulous attention to detail
- refers to the speaker or writer
- iodine
- current
- isospin
- a particular affirmative categorial statement, such as some men are married, often symbolized as SiP
- one
- Italy (international car registration)
- used between elements in a compound word
- of or relating to a region or people, esp of the Middle East
- International
- Island or Isle