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The autocomplete widget is intended to provide your users with suggestions to avoid them for typing the complete word. If you want to force them to select a predefined option then I think your best approach would be to use a dropdown.
Let us know if you have further questions.
The user needs to select from one of 14,000 items. A dropdown becomes unmanageable. Any other suggestion?
Can these items be filtered by categories?
For example, if the items were city names you could filter them by Country, then Village, etc.
I'm thinking that it would be a heavy work for a form to load 14,000 items, so if it were possible to split these items into categories it could be a manageable task for the dropdown.
If you don't want to use a dropdown at all and still want to load all items, then another solution that I can think of is using the full source code of your form and use the JQuery autocomplete plugin with an event listener that would force the user to select an item from the list as described here: http://stackoverflow.com/questions/11681292/jquery-autocomplete-how-to-force-selection-from-list-keyboard
Your question has been moved to separate thread:
http://www.jotform.com/answers/551141 and we will answer on your question there.