Definition - The imperfect matching of meaning in different languages, i.e. the quality of different languages that gives similar almost synonymous words different scopes of meaning.

For example, English and Russian are anisomorphic with respect to colour terms: In English light blue and navy blue are shades of one colour; whereas in Russian they are two different colours with two different names.

Etymology -
The word derives from the Greek combining form ἄνισος, unequal.

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