1. Noun, Suru verb, Transitive verb, Noun which may take the genitive case particle 'no'

   1.

   enclosing (e.g. with a letter)

Example sentences

• 返信が必要な場合は、返信用封筒に切手を貼って同封してください。

  Include a stamped addressed envelope if you want a response.

• ７月２２日付けのお手紙につきまして私共の最新の目録を同封します。

  With regard to your letter of July 22nd, I enclose our most recent catalogue.