terminology

noun

1. (countable, uncountable)A treatise on terms, especially those used in a specialised field.
2. (countable, uncountable)The set of terms actually used in any business, art, science, or the like; nomenclature; technical terms.

   “Ad for advertisement is struggling hard for general recognition; some of its compounds, e. g., ad-writer, want-ad, display-ad, ad-card, ad-rate, column-ad and ad-man, are already accepted in technical terminology.”

   “[The researchers] noticed many of their pieces of [plastic marine] debris sported surface pits around two microns across.[…]Closer examination showed that some of these pits did, indeed, contain bacteria, and that in several cases these bacteria were dividing and thus, by the perverse arithmetic of biological terminology, multiplying.”

   “Language is always changing — but it shouldn’t become inflexible, especially when new terminologies, in the name of inclusion, sometimes wind up making others feel excluded.”

3. (countable, uncountable)The scientific study of such terms.