illustrated embodiments provide a computer implemented method , an apparatus , and a computer program product for unsupervised stemming schema learning and lexicon acquisition from corpora . in one illustrative embodiment , the computer implemented method obtains a corpus from corpora , analyzes the corpus to deduce a set of possible stemming schema and reviews and revises the set of possible stemming schema , to create a pruned set of stemming schema . the computer implemented method further deduces a lexicon from the corpus using the pruned set of stemming schema .