I
I. A. Richards
i.e. vs. e.g.
iamb
iambic pentameter
Ibn Abi Ishaq
ideogram
ideograph
idiolect
idiom
idiotism
if vs. whether vs. when
illative case
illative particle
illeism
imperfect participle
imperfect tense
imply infer
indefinite pronoun
independent clause
independent marker word
indirect object
Indo-European
infinitive
infix
inflection
inflectional root
initialism
intensifier
intensive pronoun
interfix
interjection
interpunct (·)
interrogative pronoun
intransitive verb
iota
iota subscript
irony
irony mark
isocolon