Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A subdivision of a field of study; a subdiscipline.
  • n. Mathematics A field that is a subset of another field.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A smaller, more specialized area of study or occupation within a larger one
  • n. A subring of a field, containing the multiplicative identity and closed under inversion.

Etymologies

sub- +‎ field (Wiktionary)

Examples

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