9. Grammatical meanings

Notional words, first of all verbs and nouns, possess some morphemic features expressing grammatical (morphological) meanings. These features determine the grammatical form of the word.

Grammatical meanings are very abstract, very general. Therefore the grammatical form is not confined to an individual word, but unites a whole class of words, so that each word of the class expresses the corresponding grammatical meaning together with its individual, concrete semantics.

For instance, the meaning of the substantive plural is rendered by the regular plural suffix -(e)s, and in some cases by other, more specific means, such as phonemic interchange and a few lexeme-bound suffixes. Due to the generalised character of the plural, we say that different groups of nouns "take" this form with strictly defined variations in the mode of expression, the variations being of more systemic (phonological conditioning) and less systemic (etymological conditioning) nature. Cf.: faces, branches, matches, judges; books, rockets, boats, chiefs, proofs; dogs, beads, films, stones, hens; lives, wives, thieves, leaves; girls, stars, toys, heroes, pianos, cantos; oxen, children, brethren, kine; swine, sheep, deer; cod, trout, salmon; men, women, feet, teeth, geese, mice, lice; formulae, antennae; data, errata, strata, addenda, memoranda; radii, genii, nuclei, alumni; crises, bases, analyses, axes; phenomena, criteria.

8. Three main types of distribution of morphemes

The "Allo-emic" theory. Further insights into the correlation between the formal and functional aspects of morphemes within the composition of the word may be gained in the light of the so-called "allo-emic" theory put forward by descriptive linguistics and broadly used in the current linguistic research.

In accord with this theory, lingual units are described by means of two types of terms: allo-terms and eme-terms. Eme-terms denote the generalised invariant units of language characterised by a certain functional status: phonemes, morphemes. Allo-terms denote the concrete manifestations, or variants of the generalised units dependent on the regular co-location with other elements of language: allophones, allomorphs. A set of iso-functional allo-units identified in the text on the basis of their co-occurrence with other lingual units (distribution) is considered as the corresponding eme-unit with its fixed systemic status.

Distributional analysis. The allo-emic identification of lingual elements is achieved by means of the so-called "distributional analysis". The immediate aim of the distributional analysis is to fix and study the units of language in relation to their textual environments, i.e. the adjoining elements in the text.

The environment of a unit may be either "right" or "left", e.g.: un-pardon-able.

In this word the left environment of the root is the negative prefix un-, the right environment of the root is the qualitative suffix -able. Respectively, the root -pardon- is the right environment for the prefix, and the left environment for the suffix.

The distribution of a unit may be defined as the total of all its environments; in other words, the distribution of a unit is its environment in generalised terms of classes or categories.

Three main types of distribution are discriminated in the distributional analysis, namely, contrastive distribution, non-contrastive distribution, and complementary distribution. Contrastive and non-contrastive distributions concern identical environments of different morphs. The morphs are said to be in contrastive distribution if their meanings (functions) are different. Such morphs constitute different morphemes. Cf. the suffixes -(e)d and -ing in the verb-forms returned, returning. The morphs are said to be in non-contrastive distribution (or free alternation) if their meaning (function) is the same. Such morphs constitute "free alternants", or "free variants" of the same morpheme. Cf. the suffixes -(e)d and -t in the verb-forms learned, learnt.

As different from the above, complementary distribution concerns different environments of formally different morphs which are united by the same meaning (function). If two or more morphs have the same meaning and the difference in (heir form is explained by different environments, these morphs are said to be in complementary distribution and considered the allomorphs of the same morpheme. Cf. the allomorphs of the plural morpheme /-s/, /-z/, /-iz/ which stand in phonemic complementary distribution; the plural allomorph -en in oxen, children, which stands in morphemic complementary distribution with the other allomorphs of the plural morpheme.

As we see, for analytical purposes the notion of complementary distribution is the most important, because it helps establish the identity of outwardly altogether different elements of language, in particular, its grammatical elements.