Install dict-gcide by entering the following commands in the terminal:
sudo apt update sudo apt install dict-gcide
Comprehensive English Dictionary
This package contains the GNU version of the Collaborative International Dictionary of English, formatted for use by the dictionary server in the dictd package. The GCIDE contains the full text of the 1913 Webster's Unabridged Dictionary, supplemented by many definitions from WordNet, the Century Dictionary, 1906, and many additional definitions contributed by volunteers. . The definitions in the core of this dictionary are at least 85 years old, so they can not be expected to be politically correct by contemporary standards, and no attempt has been, or will be, made to make them so. . This package will be of limited use without the server found in the dictd package, or another RFC 2229 compliant server.