The Lemma reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Lemma

In mathematics, a lemma expresses a minor theorem, of interest primarily because it serves in the proof of a major result.

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In linguistics, and particularly in morphology, a lemma comprises the canonical form of a word. Lemmas have especial significance in highly inflected languages such as Czech.

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