-mə̇nə(r) noun
( -s )
: one that determines: as
a. : an inheritance factor : gene , determinant
b. : a word belonging to a group of limiting noun modifiers that in English consists of a, an, any, each, either, every, neither, no, one, some, the, that, those, this, these, what, whatever, which, whichever, possessive adjectives (as my ), and possessive-case forms (as Joe's ) and is characterized by occurrence before descriptive adjectives modifying the same noun (as that in “that big yellow house” or his in “his new car”)