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...of suffixes and prefixes and other affixes to a word that change the meaning or application of the root word or root stem. In other words, an allomorph accomplishes a transformation from one word to another. The new word will have a different semantic use and quite possibly a different meaning, and often, both.
Even in the common transformation from singular to plural, for example, the suffix -s pluralizes the root word in regular form (the common English lexical form) to make the transition. Less common is the suffix –ren which is used to transform child to the plural, an irregular lexical form applying only to the single word child. Falk, YN. Morphology: Allomorphy. Retrieved 5 Jan. 2005 from: http://pluto.mscc.huji.ac.il/~msyfalk/Morph/Allomorphy.pdf
The suffix –ly most...