Mac OS X

(redirected from OSX)
Also found in: Medical, Acronyms, Wikipedia.

Mac OS X

(operating system)
/mak oss ten/ Version 10 of the Macintosh Operating System, based on FreeBSD unlike prevoius versions. Apple released the kernel of Mac OS X Server as "darwin", under an open source license. Mac OS X incldues a code framework called the "Core Foundation" and an "Application Kit" framework for GUI and widgets strongly derived from NEXTSTEP.
This article is provided by FOLDOC - Free Online Dictionary of Computing (

Mac OS X

(Mac OS 10) The operating system from Apple for the Mac family from 2001 until the fall of 2016, at which time the Sierra OS Version 10.12 began using the rebranded "macOS" moniker. As a result, all the names of Apple operating systems have the same OS suffix (macOS, iOS, iPadOS, tvOS). See macOS and Sierra.

OS X Server was introduced in 1999, and the client version came out in 2001. Based on Unix and featuring an entirely redesigned user interface, OS X was a major departure from the previous OS 9 system. For the first time, the rich set of Unix commands became available to all Mac developers (A/UX was an earlier Unix OS for the Mac but was not widely used).

OS X added protected memory, pre-emptive multitasking, multithreading and symmetric multiprocessing (SMP) to the Mac world. The heart of OS X is the open source, POSIX-compliant Darwin kernel, which includes an enhanced BSD 4.4 operating system and Mach 2.5 microkernel. See HFS.

Legacy Software
Prior to Mac OS X 10.5 (Leopard), OS X ran legacy OS 9 and earlier applications via its Classic software, which was a full copy of OS 9 that ran as an OS X process. Classic was not preloaded on new Macs, but was available for installation from the system disks.

In 2006, Apple switched from the PowerPC to the Intel platform, and Classic support was dropped in the Intel version of OS X. However, PowerPC applications could run on Intel Macs via an emulator (see Rosetta).

Programming Environments
There have been five programming interfaces (APIs) for writing Mac OS X applications. Cocoa is the native OS X interface, derived from OpenStep. Carbon is used for applications that can run on both OS X and earlier Mac OS machines, and Classic is the API prior to Mac OS X. Programs can also be developed in Java and BSD. See OpenStep and Cocoa.

Faster Cats!
Mac OS X versions were internally code-named after jungle cats. Starting with Version 10.2 (Jaguar), the animals became part of the official product name until Version 10.9 when places in California were used instead (see below). See Rhapsody and Bonjour.
macOS Version  Place
  11.0   2020     Big Sur
  10.15  2019     Catalina
  10.14  2018     Mojave
  10.13  2017     High Sierra
  10.12  2016     SierraOS X Version   Place
  10.11  2015     El Capitan
  10.10  2014     Yosemite
  10.9   2013     MavericksOS X Version   Jungle Cat
  10.8   2012     Mountain Lion
  10.7   2011     Lion
  10.6   2009     Snow Leopard
  10.5   2007     Leopard
  10.4   2005     Tiger
  10.3   2003     Panther
  10.2   2002     Jaguar
  10.1   2001    Puma (code name)
  10.0   2001    Cheetah (code name)
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
“The ER-210 for Mac OSX is a unique data recovery software, which Mac users have been wishing for, for a number of years - this is a great addition to the data recovery tool box,” said Lee Parry, CEO of Infinity Wireless (developers of the Enigma Recovery range).
If the court accepts OSX's request, the company will have 60 days to come up with a restructuring plan.
Following the stake buy, Goldman represents OSX's second-largest stockholder.
The shipbuilder's controlling shareholder, Brazilian tycoon Eike Batista, is currently selling operations as part of a restructuring of his public commodities and logistics firms, which failed to meet operational and financial targets.Country: BrazilSector: Water TransportTarget: OSX Brasil SABuyer: Goldman Sachs Group IncType: StakebuildingStatus: Closed
Results also demonstrated that NBIF up-regulated the expression of runt-related transcription factor 2 (Runx2) and Osterix (Osx), the bone-specific transcription factors participating in regulation of bone marker genes expression.
The investment comes as EBX seeks to raise an additional $1 billion for its shipbuilding and ship-leasing company OSX Brasil and billions more in debt and equity capital to expand oil and gas output, complete port facilities, build thermal power plants, and dig iron ore and coal mines.
6 September 2011 - Norwegian ship-equipment maker TTS Group ASA (OSL:TTS) said today its unit TTS Energy AS and a consortium of companies signed a letter of intent (LoI) to provide two wellhead platform drilling units (WPDU) for oil and gas company OSX Brasil SA (SAO:OSXB3).
So I wanted to talk about document visibility today, but since I updated to Mac OSX Lion yesterday, let me rather talk about that.
All games are cross-platform (Windows, Mac OSX, Linux)
The OSX.iWork threat can unleash malicious code onto the user's Mac which then connects them toa remote system hosted elsewhere.
OSX Brasil SA (OSX Brasil) (OSXB3.BR), the shipbuilder and offshore services company owned by Brazilian billionaire Eike Batista, has commenced environmental studies to establish a shipyard in Rio de Janeiro state, southeast Brazil.
The event, being held at I-Space, in Hamla, will focus on the Mac OSX Snow Leopard system.