Suppletion refers to a morphological phenomenon where an irregular morphological pattern replaces a regular inflectional pattern, resulting in completely different forms for a given word. This occurs when a related word form does not share any phonetic resemblance with the root, often seen in cases like 'good' and 'better' or 'go' and 'went'. The uniqueness of suppletion is significant in understanding how languages evolve and develop irregularities in their grammatical structures.
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