- plural of O.
os
1 Americannoun
noun
noun
-
(of the calendar) Old Style.
-
out of stock.
-
(in banking) outstanding.
abbreviation
abbreviation
-
Old School
-
Old Style (method of reckoning dates)
-
Ordinary Seaman
-
(in Britain) Ordnance Survey
-
outsize
-
Old Saxon (language)
abbreviation
-
out of stock
-
banking outstanding
symbol
noun
noun
noun
Other Word Forms
Noun Inflected Forms
Etymology
Origin of os1
First recorded in 1540–50; from Latin os (inflectional stem oss- ) “bone”
Origin of os2
First recorded in 1730–40; from Latin ōs (inflectional stem ōr- ) “mouth”
Origin of os3
First recorded in 1840–50 as osar (plural); from Swedish ås (plural åsar ) “ridge (of a hill),” from Old Norse áss “thick pole or main beam; rocky ridge”
Origin of O.S.8
From Latin oculus sinister
Vocabulary lists containing os
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
A new Longevity Preparedness Index from John Hancock and MIT AgeLab os based on a survey of over 1,300 adults and focused on eight areas such as finance, home, health and community.
From MarketWatch ● Dec. 12, 2025
She first broke through with 2016’s “Remonta,” an album she recorded with her former band Liniker e os Caramelows.
From Los Angeles Times ● Oct. 8, 2025
You could talk to him about os and argos, suet and grease, croteys, fewmets and fiants, but he only looked polite.
From "The Once and Future King" by T. H. White
![]()
In the 19 3 os, track experts were beginning to toss around the idea of a four-minute mile.
From "Unbroken" by Laura Hillenbrand
![]()
The os in his calculations were only intermediaries, crutches that vanished miraculously by the end of the computation.
From "Zero: The Biography of a Dangerous Idea" by Charles Seife
![]()
"The Dutch experience in my opinion offers a warning for Canada," Os cautioned.
From BBC ● May 15, 2026
Another hurdle that Os had to overcome in her career is an ongoing stigma placed on influencers-turned-pop stars.
From Los Angeles Times ● Mar. 20, 2026
Os, born Kenia Guadalupe Flores Osuna in Mazatlán, Sinaloa, has made an incredible leap from social media influencer to Latin Grammy-nominated pop star in under a decade.
From Los Angeles Times ● Mar. 20, 2026
Os has even accompanied Pluma on a few stops of his recent Dinastía Tour.
From Los Angeles Times ● Mar. 20, 2026
James pointed to a paragraph on his answer key made entirely of Os and Is:
From "Book Scavenger" by Jennifer Chambliss Bertman
![]()
"We don't know if he's still alive," his aunt Francesca told the BBC World Service's OS programme.
From BBC ● Jan. 2, 2026
Palantir’s project with the Navy, called Ship OS, is aimed at better managing the supply chain by replacing workers needed to manually track parts and predicting when components are needed.
From Barron's ● Dec. 10, 2025
Palantir’s project with the Navy, called Ship OS, will initially include two major shipbuilders, three public shipyards and more than 100 suppliers, the Navy said.
From The Wall Street Journal ● Dec. 9, 2025
In the movie, the OS ad that Theo comes upon says, “We ask you a simple question: Who are you? What can you be? Where are you going? What’s out there?”
From Slate ● Apr. 11, 2025
"Right. Well, the thing is, Pathfinder has an OS update process. So we can change the software to anything we want."
From "The Martian" by Andy Weir
![]()
O/S voice: Please can you just say it one more time?
From Washington Post ● Jul. 22, 2022
O/S voice: Can you just say it one more time?
From Washington Post ● Jul. 22, 2022
Photo courtesy of John Luke Venables I’ve been using Chrome O/S since the Chromium project was in beta, when I tested out the CR-48 for the Chromebook pilot testing program.
From Forbes ● May 6, 2013
One of the issues pointed to with Chrome O/S is that you have no control over your local data, because you are using a “glorified browser,” but this is not the case.
From Forbes ● May 6, 2013
He needed a group that knew the strengths and weaknesses of every major O/S to fulfill his mission.
From Terminal Compromise: computer terrorism: when privacy and freedom are the victims: a novel by Schwartau, Winn
Result: when French police once got a lead into the O.S., it swiftly collapsed.
From Time Magazine Archive
![]()
To the chagrin of the search committee, word has leaked out that Criswell favored O.S.
From Time Magazine Archive
![]()
Friend Hopper was one of the party, and they asked him to have his head examined by the well-known O.S.
From Isaac T. Hopper by Child, Lydia Maria Francis
Washington was born February 11, 1731 O.S., so that while writing in this book he was either near the close of his fourteenth, or in his fifteenth, year.
From George Washington's Rules of Civility Traced to their Sources and Restored by Moncure D. Conway by Conway, Moncure Daniel
Rebuking himself for squeamishness, the station-agent returned to his office, caught an O.S. from the wire, took some general instructions, and went out to look at the weather.
From Success A Novel by Adams, Samuel Hopkins
When dealing with fluids other than serum the diluent is usually distilled water; whilst if the original substance is a solid the instructions would read: 1 gram o.s.
From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by Eyre, J. W. H. (John William Henry)
He was courteously received on January 26 o.s., and was granted an audience by the House of Commons, but the decision had already been taken and his efforts were unavailing.
From History of Holland by Edmundson, George
"WOW rita ora really ate this look up i am fully obsessed with it!!" wrote one fan on Twitter.
From Salon ● May 2, 2023
Is the museum presenting the history of cinema ora history of cinema?
From Los Angeles Times ● Sep. 7, 2021
Kia ora koutou – wherever this finds you around this glorious Commonwealth of ours!
From The Guardian ● Apr. 9, 2018
The party was able to push ahead with policies to foster the Maori language and a strategy to deliver services to Maori people called whanau ora, after the native word for family.
From BusinessWeek ● Nov. 29, 2011
While it could brand notorious offenders it was able also to unmask hypocritical pretences— Detrahere et pellem, nitidus qua quisque per ora Cederet, introrsum turpis.
From The Roman Poets of the Republic by Sellar, W. Y.
The osar are similar to the kames of Scotland and the eschars of Ireland.
From The Gutenberg Webster's Unabridged Dictionary Section M, N, and O by Project Gutenberg
An I.N.S. photographer found McCarthy propped up in bed in blue pajamas, swathed in bandages from his tuberositas deltoidea to his ossa metacarpalia.
From Time Magazine Archive
![]()
The bones I am most anxious to obtain, are those of the head and feet, which are said to be among those found in your State, as also the ossa innominata, and scapula.
From Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson, Volume 3 by Randolph, Thomas Jefferson
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.