Top Definition
<noun> A word used to denote those small silly accidents which sometimes take us by surprise, and which could have been avoided, had we only paid better attention.

Accillidents are a common occurrence with ADD sufferers, university professors and the elderly who still insist they can drive, "There's nothing wrong with my eyesight Neville!".

Accillidents are also often excluded in insurance policies, falling under the proviso "Random Acts of God's Sense of Humour".
Neville's boss: "Why are you late Neville?

Neville: "Sorry sir, my grandmother had a bit of an accillident this morning. She mistook the lawnmower for her wheelchair, and it took us quite a while to catch up with her."
by photofx March 23, 2010

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