Hold Shift and open Dictionary app
Worked for me.
THANK YOU, THANK YOU, THANK YOU! Since installing MacOS 10.13.4 Public Beta 1 all my dictionaries except Wikipedia had disappeared and your suggestion restored them all to full functionality. That one goes into my list of trouble-shooting tricks.
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Apparently the cost of publication rights for the Oxford dictionaries is not an issue for Apple because the dictionaries that showed up on my Mac are:
- New Oxford American Dictionary
- Oxford American Writer's Thesaurus
- Apple Dictionary
- Wikipedia
- Oxford Thesaurus of English
- Oxford Dictionary of English
- พจนานุà¸à¸£à¸¡à¹„ทย ฉบับทันสมัยà¹à¸¥à¸°à¸ªà¸¡à¸šà¸¹à¸£à¸“์ (that's Thai)
- Gran Diccionario Oxford - Español-Inglés • Inglés-Español
- Dicionário de Português licenciado para Oxford University Press
- Толковый Ñловарь руÑÑкого Ñзыка
- Arkadaş Türkçe Sözlük