n. (also i) (pl. Is or I's)
1 the ninth letter of the alphabet.
2 (as a Roman numeral) 1.
Phrases and idioms:
I-beam a girder of I-shaped section.
pron. & n.
—pron. (obj. me; poss. my, mine; pl. we) used by a speaker or writer to refer to himself or herself.
—n. (the I) Metaphysics the ego; the subject or object of self-consciousness.
Etymology: OE f. Gmc
symb. Chem. the element iodine.
abbr. (also I.)
Useful english dictionary. 2012.