noun cas·tel·la·tion \ˌkastəˈlāshən\

Definition of castellation



  1. 1 :  the act of castellating

  2. 2 :  a castellated structure

  3. 3a :  battlement b :  a groove or recess in a castellated structure (as a nut) a cotter pin passing through the castellation and the hole in the bolt

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of castellation

Medieval Latin castellation-, castellatio, from castellatus + -ion, -io -ion

Seen and Heard

What made you want to look up castellation? Please tell us where you read or heard it (including the quote, if possible).


capable of being understood in two ways

Get Word of the Day daily email!