verb (used with object)
to place in position or connect for service or use: to install a heating system; to install software on a computer.
to establish in an office, position, or place: to install oneself in new quarters.
to induct into an office or the like with ceremonies or formalities.
Also, instal.

1375–1425; late Middle English < Medieval Latin installāre. See in-2, stall1

installer, noun
preinstall, verb (used with object)
reinstall, verb (used with object)

install, instill.

3. invest, instate, receive. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
install or instal (ɪnˈstɔːl)
vb , -stalls, -stalling, -stalled, -stals, -stalling, -stalled
1.  to place (machinery, equipment, etc) in position and connect and adjust for use
2.  to transfer (computer software) from a distribution file to a permanent location on disk, and prepare it for its particular environment and application
3.  to put in a position, rank, etc
4.  to settle (a person, esp oneself) in a position or state: she installed herself in an armchair
[C16: from Medieval Latin installāre, from in-² + stallumstall1]
instal or instal
[C16: from Medieval Latin installāre, from in-² + stallumstall1]
in'staller or instal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1548, "place in (ecclesiastical) office by seating in an official stall," from M.L. installare, from L. in- "in" + M.L. stallum "stall," from a Gmc. source (cf. O.H.G. stal "standing place;" see stall (1)). Installation "act of setting up" (machinery, etc.) is first recorded 1882.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

installer definition

operating system
A utility program to ease the installation of another, probably larger, application. It is also possible for hardware to have an installer accompany it, to install any low level device drivers required.
The installer commonly asks the user to enter desired configuration options for the main program or hardware, and sets up various initialisation files accordingly, as well as copying the main program to a hard disc.
Some badly designed operating systems require applications to provide an uninstaller because of the number of different files modified or created during the installation process.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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