Determiner
Part of speech: noun
Definition: A member of a class of words functioning in a noun phrase to identify or distinguish a referent without describing or modifying it. Examples of determiners include articles (a, the), demonstratives (this, those), cardinal numbers (three, fifty), and indefinite numerals (most, any, each). A dependent function in a noun phrase marking the NP as definite or indefinite. This function is usually filled by words in the determinative class but may be filled by other elements such as a genitive pronoun. Something that determines, or helps someone to determine, something else.
Determinant
Part of speech: noun
Definition: A determining factor; an element that determines the nature of somethingThe unique scalar function over square matrices which is distributive over matrix multiplication, multilinear in the rows and columns, and takes the value of 1 for the unit matrix. Abbreviation: detA substance that causes a cell to adopt a particular fate.