IPA: /dɪˈtɜːrmɪnər/
KK: /dɪˈtɜrmɪnər/
A word that helps specify or limit the meaning of a noun, such as articles, possessives, or demonstratives, and usually appears at the beginning of a noun phrase.
In the sentence 'The cat is sleeping', 'the' is a determiner that specifies which cat is being referred to.
Determiner → It is formed from "de-" (meaning down or away) and "terminare" (meaning to limit or set boundaries). The word "determiner" refers to a word that limits or specifies a noun, thus setting boundaries on its meaning.
Think of a word that 'limits' or 'sets boundaries' on a noun — 'de-' suggests down or away, and 'terminare' means to limit.