Pronunciation: (ī),[key] —n., —pl.I's or Is, i's or is. 1. the ninth letter of the English alphabet, a vowel.
2. any spoken sound represented by the letter I or i, as in big, nice, or ski. 3. something having the shape of an I. 4. a written or printed representation of the letter I or i. 5. a device, as a printer's type, for reproducing the letter I or i.
Pronunciation: (ī),[key] —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. 1. (used to denote the narrator of a literary work written in the first person singular).
2. Metaphys.the ego.
interstate (used with a number to designate an interstate highway): I-95.
—Symbol. 1. the ninth in order or in a series.
2. (sometimes l.c.) the Roman numeral for 1. Cf. Roman numerals. 3. Chem.iodine.
6. Logic.See particular affirmative.
Math. 1. Also calledimaginary unit. the imaginary number .
2. a unit vector on the x-axis of a coordinate system.
—Symbol,Physics. isotopic spin.
var. 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.