Parts I to III of this series have examined the terminology of Termino
logy by contrast with the vocabulary of Onomantics and identified some
of the differences and difficulties revealed by a close study of ISO-
1087, the most important glossary for terminologists. Parr IV, finally
, offers a speculative explanation of these problems. My central hypot
hesis is that all aversion to neologisms - especially newly coined wor
ds - impedes the introduction and acceptance of new concepts. The pres
sure for standardization of terminology compounds this difficulty. The
re are three kinds of neologisms: 1. newly coined words (neoterisms),
2. phases composed of familiar words (phrasal tags) and 3. familiar wo
rds for which new meanings have been stipulated (meta-terms). Neologis
ms in the form of phrases containing familiar words are often found in
ISO 1087. Some perplexing ambiguities in ISO 1087 occur when new mean
ings are stipulated. for familiar words, creating terminological metap
hors (''meta-terms'') that are often obscure. Such meta-terms abound i
n the terminology of Terminology. Increased willingness to accept well
-formed new words (neoterisms) would greatly simplify the development
of a more adequate terminology for Terminology. The use of pleonasms i
s recommended as a technique to overcome ambiguity by linking familiar
words having new meanings (meta-terms) to new words for the same conc
epts (neoterisms) and as a simple way to facilitate the introduction o
f such neoterisms.