A Determiner is a word, phrase or affix that occurs together with a noun or noun phrase and serves to express the reference of that noun or noun phrase in the context. That is, a determiner may indicate whether the noun is referring to a definite or indefinite element of a class, to a closer or more distant element, to an element belonging to a specified person or thing, to a particular number or quantity, etc.Common kinds of determiners include definite and indefinite articles (like the English the and a[n]), demonstratives (like this and that), possessive determiners (like my and their), and quantifiers (like many, few and several).

Examples
  • The girl is a student.
  • I've lost my keys.
  • Some folks get all the luck.
  • Which book is that?
  • I only had thirty-seven drinks.
  • I'll take this one.
  • Both windows were open.