Meaning of I in English

I

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

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.