Correct spelling for the English word "milline" is [mˈɪlɪn], [mˈɪlɪn], [m_ˈɪ_l_ɪ_n] (IPA phonetic alphabet).
Milline is not a recognized English word, and therefore doesn't have an official dictionary definition in the English language. It may be a borrowing from another language or a typographical error.
However, in Estonian, "milline" is a common word meaning "which" in English. It is an interrogative pronoun used to inquire about the specific nature or identity of an object or situation from a selection or range of options. It helps to establish or clarify the characteristics, qualities, or conditions of something by prompting for a choice or preference.
In this context, "milline" is used to request a decision or opinion about a particular matter within a set of alternatives. For example, one might ask "Milline raamat meeldib sulle rohkem?" which translates to "Which book do you like better?" This question seeks to discern someone's preference or judgment between multiple books.
The word "milline" can be vital for expressing curiosity or facilitating decision-making processes. Whether it's choosing between options, describing characteristics, or pinpointing specifications, "milline" serves as a vital tool for clarification and choice in Estonian language usage.