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iota the name of the ninth letter of the Greek alphabet. [2 definitions]
IOU a signed paper acknowledging a debt and often bearing these letters, meaning "I owe you".
-ious full of; having the characteristics of; having.
Iowa a Midwestern U.S. state between Illinois and Nebraska. (abbr.: IA) [3 definitions]
IP in computing, an abbreviation for Internet protocol, one of the main Internet communications protocols, which specifies the format of transmitted data and routing information.
iPad trademark for a tablet computer developed and sold by Apple, Inc.
ipecac either of two tropical South American plants related to madder, coffee, and gardenia, whose roots are used medicinally. [2 definitions]
iPhone trademark for a type of mobile telephone that includes an internet browser, camera, and music player.
iPod trademark for a pocket-sized digital audio player with a large storage capacity, primarily used to collect and play back downloaded digital music files.
ipomoea a plant of the morning glory family that has heart-shaped leaves and bears showy flowers. [2 definitions]
ipse dixit (Latin) he himself said it; an unproven or dogmatic assertion.
ipsilateral pertaining to, situated on, or affecting the same side of the body.
ipso facto (Latin) by that fact itself.
IQ abbreviation of "intelligence quotient," a representation of mental age as determined by intelligence tests.
Ir symbol of the chemical element iridium.
ir-1 in; into. [2 definitions]
ir-2 not; without.
IRA abbreviation of "Individual Retirement Account."
I.R.A. abbreviation of "Irish Republican Army."
Iran a Middle Eastern country between Turkmenistan, the Caspian Sea, and the Persian Gulf.
Iranian of or pertaining to Iran or its people, culture, or the like; Persian. [4 definitions]