Talk:interstitial

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I noticed this word being used in a way unfamiliar to me:

"We reserve the right to put such content, or any knol containing mature content, behind an interstitial." - Google Knol - Content Policy

Is this being used incorrectly as a noun or is there a further definition that Wiktionary lacks? - TheDaveRoss 05:58, 1 February 2009 (UTC)