pre‧de‧ter‧min‧er /ˌpriːdɪˈtɜːmənə, ˌpriːdɪˈtɜːmɪnə $ -ˈtɜːrmənər/ noun [countable]
technical a word that is used before a determiner (=a word such as ‘the’, ‘that’, ‘his’ etc). In the phrases ‘all the boys’ and ‘both his parents’, the words ‘all’ and ‘both’ are predeterminers.

[TahlilGaran] Dictionary of Contemporary English ▲