Real Dictionary

-i in British English
suffix forming adjectives: of or relating to a region or people, esp of the Middle East

-i- in American English
forming compound words
connective vowel: 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

-i- in British English
connective vowel: used between elements in a compound word

I
pronoun: A speaker or writer uses I to refer to himself or herself. I is a first person singular pronoun. I is used as the subject of a verb.
variable noun: I is the ninth letter of the English alphabet.

I in American English
noun: the ninth letter of the English alphabet, a vowel

I in American English 1
a Roman numeral for 1; placed after another Roman numeral, it adds one unit (e. g., VI = 6), and placed before another numeral, it subtracts one unit (e.g., IV = 4)
the ninth letter of the English alphabet: via Latin from the Greek iota, a modification of the Phoenician (Semitic yodh, a hand): this letter, first dotted in the 11th cent., was not distinguished from j until the 17th cent.
noun: (used to denote the narrator of a literary work written in the first person singular)
pronoun: the nominative singular pronoun, used by a speaker in referring to himself or herself

I in American English 2
a Roman numeral for 1
the person speaking or writing: personal pronoun in the first person singular
abbreviation: interstate (used with a number to designate an interstate highway)

I in American English 3
Imperator
interest
symbol: the ninth in order or in a series

I in American English 4
-1, the square root of negative one
electric current

i in British English
noun: the ninth letter and third vowel of the modern English alphabet
symbol for: the imaginary number √–1

I in British English 1
pronoun: refers to the speaker or writer

I in British English 2
symbol for: iodine

i- in American English
y-
prefix

i. in American English
abbreviation: imperator
abbreviation: Independent

I. in British English
abbreviation for: International