I would recommend using the term "timex". It is a invented term, a.k.a. coined term or neoligism, to which can be attached the apprpriate definition as well as a note at the end of such defintion of " Formerly known as xtime". "Time" as word is used with multiple meanings and its use can quickly become confusing and inadvertently may have unforeseen results. Having the x precede the _resolves the ambiguity resulting from the x after _ . Trust that this is of some help - Jake Knoppers P.S. For questions of this nature you may find ISO 2788 - Guidelines for the establishment and development of monoligual thesauri and ISO 5964 Guidelines for the establishment and development of multilingual thesauri to be of some help. They include rules for the establishment of terms and controlled vocabularies. If I can be of help elsewhere, SVP let me know.