This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. Frequently; repeatedly.

ad. Frequently

ad. Repeatedly

ad. Frequently; often; many times.

Ofttimes; frequently; many times; often.

ad. many times at short intervals

"So not only are we going after terror-sponsoring states, we've also worked aggressively to take down the financial networks that support them, to take away their logistical support, which oftentimes is found buried in otherwise legitimate organizations, non-governmental and charitable organizations."

often    ofttimes   

frequently    often