specifier

Pronunciation: /ˈspɛsəˌfaɪɚ/

The English word “specifier” has 2 meanings listed here.

noun

A person or thing that specifies.
A component of a phrase that is non-recursive and not found as a sister of the head of the phrase, but rather as a daughter of the maximal projection of the phrase.

From specify + -er.

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