Correct spelling for the English word "diplomaticses" is [dˈɪpləmˌatɪksɪz], [dˈɪpləmˌatɪksɪz], [d_ˈɪ_p_l_ə_m_ˌa_t_ɪ_k_s_ɪ_z] (IPA phonetic alphabet).
"Diplomaticses" is not a recognized word or term in the English language. As such, it does not have an established dictionary definition. It is possible that you may be referring to the plural form of the word "diplomatics," which itself is a relatively uncommon term.
"Diplomatics" refers to the study and analysis of historical documents, particularly official letters, charters, and other written records of diplomatic communication. It is an interdisciplinary field that combines elements of history, paleography (the study of ancient writing systems and scripts), and archival science. Diplomatics focuses on the critical examination and interpretation of the contents, structure, authenticity, and reliability of these documents.
Scholars and researchers specializing in diplomatics strive to unveil the historical context and intentions behind the creation of such records. They examine elements like signatures, seals, dates, language, and will analyze the style and format of the document to determine its origin and legitimacy. This field contributes to the understanding of the social, cultural, and political interactions among individuals, institutions, and governments throughout history.
Given this, it is important to note that there is no recognized definition for the term "diplomaticses," and it is possible that it may have been created or used in error.