Based on the 20-volume Oxford English Dictionary, the Shorter Oxford English Dictionary contains an incredible one-third of the coverage of the Oxford English Dictionary.
Features include:
-Over 600 000 words, phrases, and definitions
-80 000 quotations illustrating words in use throughout the centuries
-85 000 audio pronunciations
-100 000 etymologies
-Pattern search and spelling suggestions
-Full Text Search and Random Word
No internet connection is required, and you can use the OS X Services feature to look up selected words in most programs.
Support for dark mode, iCloud synch enabled
Audio dictionary - WordWeb American English 
Chambers Dictionary 
Chambers Thesaurus 