I. ˈī noun
( plural i's or is ˈīz)
Usage: often capitalized, often attributive
Date: before 12th century
1.
a. : the 9th letter of the English alphabet
b. : a graphic representation of this letter
c. : a speech counterpart of orthographic i
2. : one — see number table
3. : a graphic device for reproducing the letter i
4. : one designated i especially as the ninth in order or class
5. : something shaped like the letter I
6. : a unit vector parallel to the x-axis
7.
[abbreviation for incomplete ]
a. : a grade rating a student's work as incomplete
b. : one graded or rated with an I
8. : I formation
II. abbreviation
1. industrial
2. initial
3. intelligence
4. intensity
5. intransitive
6. island; isle
III. symbol
imaginary unit