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)

a grade indicating incompletion of assigned work; an incomplete

the person speaking or writing: personal pronoun in the first person singular

the ego; the self

Imperator

incisor

Independent

interstate

Island(s)

Isle(s)

moment of inertia

electric current

iodine

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.

any of the speech sounds that this letter represents, as, in English, the vowel ( (ɪ) ) of pick, ( (i) ) of pique, or ( (aɪ) ) of pike, or, when it is unstressed, (ə) as in sanity, or the semivowel ( (j) ) in boil

a type or impression for i or I

the ninth in a sequence or group

an object shaped like I

of i or I

ninth in a sequence or group

shaped like I

a Roman numeral for 1

the inclination of a planet's orbit to some reference plane, as the ecliptic

interest

intransitive

island(s)

isle(s)

-1, the square root of negative one

y-

forming compound words