MORPHOLOGY: a process by which new words are formed by adding an
affix which happens to be phonologically null. Many linguists (e.g.
Kiparsky (1982)) account for
conversion by assuming that a null affix
is added to a base.
EXAMPLE: they account for verbs such as to clean, to thin, to slow,
to warm etc. by assuming that these have the structure [[...]A 0]V.
Kiparsky, P. (1982)