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From Teflpedia

A stem (/stem/) of a word is the basic form to which affixes (prefixes and suffixes) can be added. It differs from the root in that the latter is a morpheme, but not necessarily a word in itself.

  • Verbs: the stem talk can become talks, talked, talking, talker, talkative, talkativeness;
  • Adjectives:
    • tight can become tighten, tightening, tightened, tightly, tightness, untightened, retighten;
    • happy can become unhappy, happily, happiness;

The acronym STEM in education means “science, technology, engineering and mathematics.”

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