Correct spelling for the English word "Whitni" is [wˈɪtni], [wˈɪtni], [w_ˈɪ_t_n_i] (IPA phonetic alphabet).
Whitni is not a term that appears to have an established dictionary definition. It is possible that it could be a proper noun, potentially a name. In that case, it would not have a dictionary definition as a common term or word does.
Names are typically specific to individuals, and their definitions are unique to the person they refer to. To understand the meaning or significance of the name Whitni, one would need to look for information or context related to a specific person with that name.
Names can have cultural or historical backgrounds, be derived from other words or names, or be entirely unique. It is important to approach names with sensitivity and respect for the individuals to whom they belong. Therefore, the definition of the name Whitni may vary depending on the person associated with it, and it would be inappropriate to provide a definitive dictionary definition without more context.