ASIC TERMINOLOGY
English), we can nearly always be sure that for every word in that class there will be
a wordform to express it. Thus, we can r
on the existence of a plural form fo
an
la
ust b
virtue of the fact that the
are all countable nouns, even
hough the way in which ‘plural’ is expr
ssed in these three nouns differs. Secondly,
for every syntactic feature or combina
ion of features that is ex
ressed
orphologically, we can nearly always be su
that th
r
ill
n
m
r
than
n
wordform to express it. Thus, the plural form for any one noun is nearly always
unique in any one variety of English. Even though (for example)
an
ay both be acceptable as plural forms, us
ally any one speaker will use only one of
hem, or else will differentiate them b
eanin
(‘cactus plants’ versus ‘varieties of
actus’, for example). Thirdl
, in inflection we do not t
picall
r
ard allomorphs of
two distinct morphemes as the same item, even if the
are homophonous. Thus, the
-
ffix
f n
n
an
th
-
suffix of verbs (for the third person singular of the
present tense) are usually treated as two distinct though homophonous suffixes; we
do not usually regard them as a single suffix with two radically distinct functions, o
ignifiés. This is partly, perhaps, because if
hey were a single suffix we would see
to be tolerating a peculiar kind of overlap between distinct morphemes: an
allomorph of the ‘plural’ morpheme, as such competin
with vowel chan
e and a
an
e of other suffixes, would be also an allomorph of the ‘present tense’
orpheme, with no competitors
one of these three characteristics a
lies in derivation. First, derivational
orphology is ‘gappy’. We cannot always be sure that a word with a given meaning
will exist in
arallel with other com
ex words with analogous meanings. The
xi
t
n
f
P
r
does not guarantee that the parallel existence in
English of a word meaning ‘inhabitant of Madrid’ or ‘inhabitant of Edinburgh’.
Second, derivational morphol
gy tolerates what seems like unnecessary duplication.
his is not so obviousl
demonstrable with words for inhabitants of cities (althou
h
Liverpudlian an
couse provide perhaps one example), but is clearl
seen in pairs
with overlappin
meanin
s such as
an
r
pecialit
an
ecialism
r
s
ecial
and the nouns
eakag
an
I
arefully said ‘with overlapping meanings’ rather than ‘with the same meaning’,
because there is a dee
root
d tendency in all languages to avoid perfect synonymy.
The point is, however, that derivation typica
ly does not operate so as to provide one
and only one filler for each cell in a matr
x of morphologically and semantically
elated words. Third, linguists are generally happy to treat the -
am
ffix a
th
-
r
r
‘ten pound note’. Doing this
allows them to discuss the variet
of semanticall
related functions that this suffix
performs. However, we could not conveniently talk in these terms if the -
were regarded as an allomorph of an ‘inhabitant’ morpheme in
omplementary distribution with
-
an
-
It would then be
for the
purposes of word-formation, an entirely different item from the -
r
r
which
would belong to (perhaps) an ‘agent’ mor
pheme with other allomorphs such as
-
as in
-
r
, and -
.
To avoid misunderstandin
, I should add t
at nothin
that I have said implies
hat inflectional morpholo
is in an
fundamental wa
more productive than
derivational morpholo
is. The term ‘productivit
’ is used to denote a variet
of