Everything about Complementary Distribution totally explained
Complementary distribution in
linguistics is the relationship between two different elements, where one element is found in a particular environment and the other element is found in the opposite environment. It often indicates that two superficially different elements are in fact the same linguistic unit at a deeper level. Comparing this concept to a coin, there's a "heads" side and a "tails" side. Although heads and tails differ from each other in appearance, and location, they're only two different faces of one and the same coin.
In some instances, more than two elements can be in complementary distribution with one another. Instead of an analogy with the two faces of a coin, consider an analogy with the six faces of a
dice. Each face has a different appearance and location, but each is a part of one and the same cube.
In phonology
Complementary distribution is commonly applied to
phonology, where similar
phones in complementary distribution are usually
allophones of the same phoneme. For instance, in English, [p] and [pʰ] are allophones of the
phoneme /p/ because they occur in complementary distribution. [pʰ] always occurs when it's the
syllable onset and followed by a
stressed
vowel (as in the word
pin). [p] occurs in all other situations (as in the word
spin).
There are cases where elements are in complementary distribution, but are not considered allophones. For example in English [h] and [ŋ] (
engma, written with the digraph <-ng> in English) are in complementary distribution, since [h] only occurs at the beginning of a syllable and [ŋ] only at the end. But because they've so little in common in phonetic terms they're still considered separate phonemes.
In morphology
The concept of complementary distribution is applied in the analysis of word forms (
morphology). Two different word forms (
allomorphs) can actually be different "faces" of one and the same word (
morpheme). For example, consider the English indefinite articles
a and
an. The usages
an aardvark and
a bear are grammatical. But the usages
*a aardvark and
*an bear are ungrammatical (marked with "*" in linguistics).
» The form
an is used "in the environment" before a word beginning with a vowel sound.
This linguistic environment can be notated as "
C".
» The "distribution" (usage according to environments) of the forms
an and
a is "complementary" because of three factors ---
(1)
an is used where
a isn't used;
» (2)
a is used where
an isn't used;
(3) when you take the environment where
an is used, and the environment where
a is used, the two environments together cover every legitimate potential environment for the word.
The forms
an and
a function to work together like a team, in order to take care of every instance (environment) where the English indefinite article is needed. They are like two halves of a whole, or two different faces of one and the same coin.
Further Information
Get more info on 'Complementary Distribution'.
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