Depends if you use the British or American spelling. Canceling with one L is American.

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You obviously use the US English version of the spell checker. I use the British English version.



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Wiktionary is correct.

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I wondered about that. Spell checker is fine as it's two words.

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There are many variations between British & American English. Both can be considered correct but I prefer the traditional British spelling I was taught at school. I don't really need one but you can download a spell checker dictionary in most languages & select which one to use. https://addons.mozilla.org/en-US/firefox/language-tools/

Cancel.. In its singular form.
Canceling.. This does look incomplete, but, it saves ink!
Cancelling.. Well lets review council,.. school.. rule.. tool.. add an i-n-g, you see?   

Steve M wrote on Aug 11^th, 2010 at 9:17pm:

Shcooling?
Boming?

Reminds me of another......

........is it colletbles, or collectbles?

I've not researched, but I've seen both on signs.

machineman9 wrote on Aug 11^th, 2010 at 11:10pm:

With me it's all a matter of pronunciation. Collectable sounds right. Note that it can be used as a noun or verb adjective. Again it depends on where you live. This is what Wikipedia says about it.

Spelling

Although "collectable" is the spelling listed first for the adjective by the Oxford English Dictionary and is standard spelling in British English, the dictionary observes that the "-ible" form is also valid, and has come to be common spelling in the United States.

PS. Words like canceling, modeling, traveling etc. always look wrong to me. With a single L following an E the logical pronunciation would be canceeling, modeeling, traveeling etc.