SIGMET

noun

SIG·​MET

variants or less commonly sigmet

ˈsig-ˌmet 

plural SIGMETs also sigmets

: a notice of significant hazardous weather conditions (such as extreme turbulence, icing, or poor visibility) in a large area that is provided to the pilot of an aircraft before takeoff compare airmet

Word History

Etymology

significant meteorological information

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!