Classical Mythology. a woman who, being loved by Zeus, was transformed into a white heifer and was, at the wish of Hera, first guarded by Argus and later pursued through the world by a gadfly until she reached Egypt, where she resumed her true shape: identified by the Egyptians with Isis.
Astronomy. a large volcanically active moon of the planet Jupiter.
One of the four brightest satellites of Jupiter and the fifth in distance from the planet. It was first sighted by Galileo.
See Note at moon
From Hawaiian ʿio
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
OpenAI made the io acquisition—revealing its intention to wean consumers off smartphone screens—a year after announcing a partnership with Apple to integrate ChatGPT into some parts of the iPhone.
From The Wall Street Journal ● Jul. 12, 2026
Tan spent 24 years at Apple, most recently as vice president of product design for the iPhone and Apple Watch, before co-founding io Products, which OpenAI acquired for roughly $6.5 billion in 2025.
From Barron's ● Jul. 10, 2026
Along with OpenAI, Apple is suing io Products, the design startup founded by Jony Ive, a long-time Apple executive.
From BBC ● Jul. 10, 2026
Tan left Apple to found io Products alongside Jony Ive, Apple’s former chief design officer, and other leaders.
From MarketWatch ● Jul. 10, 2026
Wasn't quite midday so the heat wasn’t overbearing and there weren’t no heat waves across the fields io make the eye see things funny.
From "Life Is So Good" by George Dawson
This inner gap likely helped capture and preserve Io, Europa, and Ganymede as they moved through the disk.
From Science Daily ● Jul. 27, 2026
Scientists have long theorized that Jupiter's four large moons -- Io, Europa, Ganymede, and Callisto -- originated from a similar disk surrounding the young planet billions of years ago.
From Science Daily ● Oct. 29, 2025
The acid yellow moon Io that orbits Jupiter may be less than 30% the size of Earth, but is considered the most volcanic body in our solar system.
From Salon ● Feb. 3, 2025
But although the planet is known to be smothered in volcanoes, an opaque atmosphere has prevented anyone from seeing an eruption the way spacecraft have spotted them on Io, the hypervolcanic moon of Jupiter.
From New York Times ● May 27, 2024
The very thin and tenuous atmosphere of Io was found by Voyager to be composed mainly of sulfur dioxide.
From "Cosmos" by Carl Sagan
They are, however, frequently abbreviated thus: Iowa, Ia. or Io.;
From Higher Lessons in English A work on English grammar and composition by Brainerd Kellogg
The I/O event was “almost entirely commercially driven,” according to Windsor.
From MarketWatch ● May 20, 2026
Google introduced Gemini 3.5 Flash on Tuesday at its annual I/O developers conference in California.
From Barron's ● May 19, 2026
During an onstage interview at Google’s I/O conference in May, Brin said he stayed very involved.
From The Wall Street Journal ● Jan. 7, 2026
Google made the announcement as part of its annual I/O developer conference in Mountain View.
From Los Angeles Times ● May 20, 2025
VM/CMS officially supports a whole bestiary of virtual card readers, virtual printers, and other phantom devices; these are used to supply some of the same capabilities Unix gets from pipes and I/O redirection.
From The Jargon File, Version 4.2.2, 20 Aug 2000 by Guy L. Steele
The senior coalition officer said the insurgents who supported the Qatar process “didn’t do a good I.O. campaign to sell it to their people.”
From New York Times ● Oct. 2, 2012
Mr. Green next day notified the Canadian Trades and Labor Congress that it must expel 30,000 C. I.O. members or renounce 120,000 A. F. of L. members.
From Time Magazine Archive
To these three the President added Sidney Hillman, pink-cheeked, blond, curly-haired, 53, chief of Amalgamated Clothing Workers of America, vice president of C. I.O., a "labor statesman," no bumbler, coldly intellectual.
From Time Magazine Archive
Between A. F. of L. and C. I.O. there still exists a thin, technical tie: the rebellious C. I. O. unions were suspended last year but they have not yet been expelled.
From Time Magazine Archive
A cabin marked I.O. is entered—every room is a cabin in a naval base.
From Submarine Warfare of To-day How the Submarine Menace was Met and Vanquished, With Descriptions of the Inventions and Devices Used, Fast Boats, Mystery Ships by Charles W. (Charles William) Domville-Fife
Preparations are under way to repatriate the remains of two teenagers from Dublin who died in separate incidents on the Greek island of Ios over the weekend.
From BBC ● Jul. 4, 2023
Post-mortem examinations are to be carried out on Tuesday on two teenagers from Dublin who died on the Greek island of Ios.
From BBC ● Jul. 3, 2023
Santorini, Mykonos and Ios, Greek islands known for their party scenes, now offer relaxing alternatives.
From New York Times ● Aug. 24, 2022
In October, they interrogated a submarine cable that connects the islands of Santorini and Ios.
From Science Magazine ● Dec. 8, 2021
The islands called the Sporades lie to the south and east of the Cyclades, among which are Amorgo, Ios, Sicinos, Thera, and Anaphe—some of which are barren, and others favorable to the vine.
From Ancient States and Empires by John Lord
This week the app overtook WeChat and TikTok to become the most-downloaded app for Apple and ios devices in China, though its popularity is not entirely due to merit.
From The Guardian ● Feb. 15, 2019
There are a lot of closeups and difficult-to-decipher geometry, but the intent here is clear — Sony is ios going to show us what the PS4 actually looks like.
From Forbes ● May 20, 2013
Android is much better, in my opinion, because it is not afraid to make drastic changes to its system. ios has looked similar since the start.
From Time ● Apr. 21, 2013
Only the brooding golden backlighting that makes theaters out of Parrish's scenar ios bespeaks a pre-neon sensibility.
From Time Magazine Archive
The price is 28,000 10000 in fives and ios 18000 50 and zoos.
From Time Magazine Archive
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
