How may Wiktionary\'s API be used to determine whether or not a word exists?
If you are using Python, you can use WiktionaryParser by Suyash Behera.
You can install it by
sudo pip install wiktionaryparser
Example usage:
>>> from wiktionaryparser import WiktionaryParser
>>> parser = WiktionaryParser()
>>> word = parser.fetch('test')
>>> another_word = parser.fetch('test', 'french')
>>> parser.set_default_language('french')