ancient light

noun

: a window or other opening that has been used 20 or more years without interruption and is therefore protected at common law against obstruction by an adjoining holder

Word History

First Known Use

1718, in the meaning defined above

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!