key date

noun

plural key dates
: a coin that is the rarest or otherwise most difficult of its series to obtain
The 1909-S wheat penny is considered a key date by collectors.

Word History

First Known Use

1976, in the meaning defined above

Time Traveler
The first known use of key date was in 1976

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!

Dictionary Entries Near key date

Cite this Entry

“Key date.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/key%20date. Accessed 14 Jul. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!