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From Dictionary.com, uninstall is a word, but uninstallation is not. I tried deinstallation and that isn't a word as well. Is there any word equivalent, ending in -tion that is a real word?

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It's probably not an official word due to lack of usage. "Uninstallation" seems to be good enough for Microsoft though. – trutheality Jul 19 '11 at 1:34
I suggest the only reason OP thinks uninstallation and deinstallation aren't words is because he's looking in the wrong place. Even NGrams has a couple of thousand usages; I'm sure there are far more than that every day across the internet - rarely misunderstood or bothersome to the readers. – FumbleFingers Jul 19 '11 at 2:07
There exist more dictionaries (and certainly more authoritative ones) than dictionary.com – nohat Jul 19 '11 at 18:35
Any recommendations? Thanks. – O_O Jul 21 '11 at 18:21
up vote 7 down vote accepted

I think a good antonym for "installation" is "removal". It doesn't end in -tion, but it is a clear word which refers to taking something out. (On the other hand, installing is putting something in.)

Interestingly, uninstall is only used in a computer science context.

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+1 to you for pointing out that many things you can install aren't uninstalled, they're removed. -1 to OP for saying uninstallation isn't a word. – FumbleFingers Jul 19 '11 at 2:00

I like deconstruction, but removal seems to be a better choice.

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Since you want a word which ends in -tion, how about extraction?

First you install an immobiliser. If the unit is faulty, you could extract the immobiliser for repair or replacement.

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