Borrowed from Latin nōmenclātūra, from nōmen ("name") + calāre ("call").

• (RP) IPA: /nə(ʊ)ˈmɛŋ.klətʃə/, /-ˈmɛn/
• (America) IPA: /ˈnoʊmənˌkleɪt͡ʃɚ/, /ˌnoʊmənˈkleɪt͡ʃɚ/

nomenclature

1. A set of rules used for forming the names or terms in a particular field of arts or sciences.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page ix:

     It is also pertinent to note that the current obvious decline in work on holarctic hepatics most surely reflects a current obsession with cataloging and with nomenclature of the organisms—as divorced from their study as living entities.

2. A set of names or terms.
3. (obsolete) A name.

• terminology

• nomenclator, nomenclatory
• numericlature

• French: nomenclature
• German: Nomenklatur
• Italian: nomenclatura
• Portuguese: nomenclatura
• Russian: номенклату́ра
• Spanish: nomenclatura