The Free Dictionary

Triggers: !define, !d, !def, !dictionary, !idioms, !tfd, !thefreedictionary

Try it

Kagi would openhttps://www.thefreedictionary.com/serendipity

URL template: https://www.thefreedictionary.com/{{{s}}}

Searches www.thefreedictionary.com, filed under Reference (words).