The dictionary form/infinitive is "geniessen," and if you mean it as a command e.g. "enjoy [your meal]" it would be "geniesst" to a group of friends or "geniessen Sie" to strangers; however, if you are looking for what to say at the start of a meal, Germans simply say "guten Appetit" (bon appetit, or good apptite).
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to enjoy - genießen - genießt - genoss - hat genossen But ... Enjoy yourself - Viel Vergnügen!