add-inadj.n.
/ˈadɪn/, U.S. /ˈædˌɪn/ Computing.
A. adj. (attributive).
Designating something added to a system internally, typically to improve the system's capabilities or performance.
ΘΚΠ
society > computing and information technology > [adjective] > added to system
add-on1979
add-in1984
1984 InfoWorld 8 Oct. 61/2 If you have a substantial investment in add-in hardware and software for the ibm pc that will not work (or work well) on the ibm pc at, then the Deskpro is a good bet for you.
1988 Washington Post 29 Feb. f47/3 It produces beautiful charts in a variety of styles that 1-2-3 can't duplicate, even with graphics add-in programs.
1998 PC World Mar. 316 You're especially likely to require enhanced input/output ports if you've got an older PC that came with two serial ports and one parallel port on an add-in card.
2007 G. Harvey Excel 2007 Workbook for Dummies xxii. 340 You need to save the workbook file..as an add-in file.
B. n.
An add-in device or component.
ΘΚΠ
society > computing and information technology > [noun] > system additions
add-on1987
add-in1988
1988 Computer Weekly 14 Apr. 6 Turning PCs into workstations for Cad or engineering applications means expensive add-ins.
1993 Compute Sept. 4/3 One of the most interesting was Microsoft at Work, which is a group of add-ins that make office equipment easier to use by improving its interface.
2004 M. Gunderloy Coder to Developer vi. 113 Some add-ins are so all-encompassing that it almost seems silly to refer to them as add-ins.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).
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adj.n.1984