Correct spelling for the English word "sonly" is [sˈʌnli], [sˈʌnli], [s_ˈʌ_n_l_i] (IPA phonetic alphabet).
"Sonly" is a term that does not have an established dictionary definition as it does not exist in the English language. It seems like a misspelled or misunderstood word as there is no reference or record of its usage in any authoritative dictionaries.
However, it is possible that you may be referring to the word "solely," which has a well-defined meaning. In that case, "solely" is an adverb that is used to denote exclusivity or singularity. It describes an action, decision, or occurrence that is done or exists without any other factors, influences, or individuals involved. It implies that something is happening or being done in a singular manner, without any additional or shared contributions.
For example, someone might say, "I solely took responsibility for completing the project," indicating that they were the only person involved in its completion.
Although the term "sonly" itself does not have a recognized meaning, it is important to note that language continually evolves, and new words can emerge over time. It is possible that "sonly" could emerge as a new term in the future, but as of now, there is no definition available.