in grammar, a word that is sometimes used before a determiner to give more information about a noun in a noun phrase(置于限定词前的)前位限定词,前位限定成分
In the phrases "all these children" and "once a day" the words "all" and "once'" are predeterminers.在短语 all these children 和 once a day 中,all 和 once 都是前位限定成分。